If M and N are any two events, then the probability that exactly one of them occurs is
A. `P(A)+P(B)+2P(A cap B)`
B. `P(A)+P(B)-P(A cap B)`
C. `P(overline(A))+P(overline(B))+P(overline(A) cap overline(B))`
D. `P(A cap overline(B)) + P(overline(A) cap overline(B))`
