Newbie, a Registered Representative Employed by Savvy Investments, Has Received

Newbie, a registered representative employed by Savvy Investments, has received a letter of complaint from a client that Ms. Newbie believes is unfair and illegitimate. More specifically, she believes that the complaint misstates the facts. Under these circumstances, Ms. Newbie:

A) can toss the complaint in the trash.
B) must respond to the complaint in writing.
C) must provide a copy of the complaint to Savvy Investments, who can decide whether or not to ignore the letter after hearing Ms. Newbie's side of the story.
D) must provide a copy of the complaint to Savvy Investments, who is required to respond to the complaint in writing and to keep a record of it.