Suppose a debt collector has been calling and sending notices of a debt you owe. If you wish to end further notification from the debt collector, you...

Suppose a debt collector has been calling and sending notices of a debt you owe. If you wish to end further notification from the debt collector, you must: 

a. obtain an injunction against further contact 

b. pay the debt in full within 30 days 

c. contact the Federal Trade Commission to request limits to notification 

d. tells the U.S. Postal Service to put such mail on the "do not deliver" list 

e. none of the other choices