Which of the Following Identifies the Primary Function of the Office

Which of the following identifies the primary function of the Office of the Comptroller of the Currency?

A) Manage the deposit insurance fund and carry out bank examinations.
B) Regulate and examine bank holding companies as well as individual commercial banks.
C) Charter national banks and approve their merger activity.
D) Determine permissible activities for state chartered banks.
E) Stand as the "lender of last resort" for troubled banks.