SHM and CSR Are Both Dependent on the Activity of Which

SHM and CSR are both dependent on the activity of which of the following enzymes?

A) AID
B) RAG-1/2
C) DNA uridine glycosylase
D) Both AID and RAG-1/2 are required for SHM and CSR.
E) Both AID and DNA uridine glycosylase are required for SHM and CSR.