Maxam Has Just Been Offered and Accepted a Full-Time Position

Maxam has just been offered and accepted a full-time position over the phone. What should Maxam do to follow up?

A) He should do nothing until he shows up the first day of work.
B) He should write a job acceptance letter to confirm the details and formalize the acceptance.
C) He should send his new boss a gift to show his appreciation.
D) He should show up for several days before his official start date to show his eagerness.