Please answer a question about the following article about IPod:

For all iPods released in 2006 and earlier, some equalizer (EQ) sound settings would distort the bass sound far too easily, even on undemanding songs. This would happen for EQ settings like R&B, Rock, Acoustic, and Bass Booster, because the equalizer amplified the digital audio level beyond the software's limit, causing distortion (clipping) on bass instruments.

Name four sound profiles that would result in bass distortion on pre-2007 iPods.
R&B, Rock, Acoustic, and Bass Booster