Question: How many albums has Kanye released since starting his solo career in 2004?

Is "He went on to explore a variety of different musical styles on subsequent albums that included the baroque-inflected Late Registration (2005), the arena-inspired Graduation (2007), and the starkly polarizing 808s & Heartbreak (2008)." the correct answer?
Possible answers: (a). yes; (b). no;
(a).