If I completed my undergraduate degree in 3 years, and continued into a post-bacc program (still considered undergraduate), could I claim the American Opportunity credit?

If I completed my undergraduate program in three years, then began a post-baccalaureate program immediately after graduating, would I be able to claim the American Opportunity credit? The post-baccalaureate program is still considered to be undergrad, but I had earned a Bachelor's degree in the end of my third year.