What is the converse of the following conditional statement? If x = -10, then x² = 100.
a. If x ≠ -10, then x² ≠ 100.
b. If x² = 100, then x = -10.
c. If x² ≠ 100, then x ≠ -10.
d. x² = 100 if and only if x = -10.