Which of the Following Statements About the Role of Physicians

Which of the following statements about the role of physicians with respect to Medicare claims is (are) true?
I.Physicians who do not accept an assignment of Medicare claims can charge as much as 200 percent of the Medicare-approved fee.
II.Physicians who accept assignment agree to accept the Medicare-approved amount as payment in full.

A) I only
B) II only
C) both I and II
D) neither I nor II