If a Check Is Received from Medicare and It Is

If a check is received from Medicare and it is obvious that it is an overpayment, the insurance billing specialist should

A) deposit the check and then write to Medicare to acknowledge the overpayment.
B) deposit the check and wait for Medicare to notify the physician of the mistake.
C) send the check back to Medicare with an explanation of the overpayment.
D) set the check aside until the overpayment issue has been resolved.