Which of these is the statement of the zero product rule?
A. If a • b = 0, then either a = 0 or b = 0, or both.
B. If a • b = 0, then a = 0 and b = 0.
C. If a • b = 0, then a = 0.
D. If a • b = 0, then either a = 0 or b = 0, but not both.
