Which of the Following Is TRUE of the Hold Button

Which of the following is TRUE of the hold button?

A) When a caller is placed on hold,it is not possible to answer calls from other extensions.
B) Patient confidentiality is breached when a call is placed on hold.
C) One should return to the caller every 2 or 3 minutes to update the continuing hold.
D) If a call requires a lengthy hold,the caller should be asked whether he or she would like to remain on hold or would prefer to leave a return call number.