The Expression $P(A \cup B)=P(A)+P(B)$ Is Valid If
A) $A$ And $B$ Are Independent

Multiple Choice

The expression $P(A \cup B) =P(A) +P(B)$ is valid if

A) $A$ and $B$ are independent.
B) $A$ and $B$ are mutually exclusive.
C) $A$ and $B$ are dependent.
D) none of these.