What Was Significant About the Strategic Arms Limitation Treaty (SALT

What was significant about the Strategic Arms Limitation Treaty (SALT I) that Nixon completed with the Soviet Union?

A) This treaty represented the first success at limiting the number of nuclear weapons produced by the United States and the Soviet Union since the beginning of the Cold War.
B) The United States and the Soviet Union, for the first time, entered into a collaborative partnership to address the conflict surrounding the Arab-Israeli dispute in the Middle East.
C) The Soviet Union agreed to stay out of the Vietnam War.
D) The United States and the Soviet Union agreed to stop covert, clandestine operations when intervening in the affairs of other nations.