45 credit audit?

Can someone please explain the 45 credit audit thing to me? DS will be coming in with a bunch of AP and DE credits, will this count for the 45 credit audit? He plans to use 50 of these credits to apply to his core, major and minor requirements. He has several others but they’d only be considered general electives so he’s not sure if there is benefit to claiming them or not.

He will need to talk to an adviser before he registers. Have him ask the question. I do not think AP credits count but I could be wrong. My DD speaks to an adviser before every semester’s registration.