Which of the Following Are Legitimate Reasons for Discontinuing Basic

Which of the following are legitimate reasons for discontinuing basic life-support measures?
1) If spontaneous breathing and a palpable pulse return
2) If a physician pronounces the arrest victim dead
3) If advanced life-support measures become available

A) 2 and 3 only
B) 1 and 2 only
C) 1, 2, and 3
D) 1 and 3 only