Question 4 Not yet answered Marked out of 2 Flag question Let a, b be real numbers. Which of the following is TRUE? Select one: O A. "ab = 0" is necessary but not sufficient for "a = 0 and b = 0" O B. "ab = 0" is neither necessary nor sufficient for "a = 0 and b = 0" O C. "ab = 0" is both necessary and sufficient for "a = 0 and b = 0" O D. "ab = 0" is sufficient but not necessary for "a = 0 and b = 0"