This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

A revised version of the ABC logo was introduced for promotions for the 2013–14 season during the network's upfront presentation on May 14, 2013, and officially introduced on-air on June 17 (although some affiliates implemented the new design prior to then), as part of an overhaul of ABC's identity by design agency LoyalKaspar. The updated logo carries a simpler gloss design than the previous version, and contains lettering more closely resembling Paul Rand's original version of the circle logo. The logo is displayed on-air, online and in print advertising in four variants shading the respective color used with the circle design's native black coloring: a gold version is primarily used on entertainment-oriented outlets (such as ABC.com, WATCH ABC, and by ABC Studios) and the on-screen bug; steel blue and dark grey versions are used primarily by ABC News; a red version is used for ESPN on ABC, while all four variants are used selectively in advertising and by affiliates. A new custom typeface, "ABC Modern" (which was inspired by the logotype), was also created for use in advertising and other promotional materials.
In 2013, ABC's identity was revamped by what design agency?

Karlheinz Brandenburg used a CD recording of Suzanne Vega's song "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was chosen because of its nearly monophonic nature and wide spectral content, making it easier to hear imperfections in the compression format during playbacks. Some refer to Suzanne Vega as "The mother of MP3". This particular track has an interesting property in that the two channels are almost, but not completely, the same, leading to a case where Binaural Masking Level Depression causes spatial unmasking of noise artifacts unless the encoder properly recognizes the situation and applies corrections similar to those detailed in the MPEG-2 AAC psychoacoustic model. Some more critical audio excerpts (glockenspiel, triangle, accordion, etc.) were taken from the EBU V3/SQAM reference compact disc and have been used by professional sound engineers to assess the subjective quality of the MPEG Audio formats.
What type of recording did Brandenburg use?

Informal learning is one of three forms of learning defined by the Organisation for Economic Co-operation and Development (OECD). Informal learning occurs in a variety of places, such as at home, work, and through daily interactions and shared relationships among members of society. For many learners this includes language acquisition, cultural norms and manners. Informal learning for young people is an ongoing process that also occurs in a variety of places, such as out of school time, in youth programs at community centers and media labs.
Who defines informal learning?