Read this: At a minimum, HDTV has twice the linear resolution of standard-definition television (SDTV), thus showing greater detail than either analog television or regular DVD. The technical standards for broadcasting HDTV also handle the 16:9 aspect ratio images without using letterboxing or anamorphic stretching, thus increasing the effective image resolution.

HDTV handles what aspect ratio without using letterboxing or anamorphic stretching?
What is the answer? (If it cannot be answered, return "unanswerable")
16:9