Which of the Following Statements Is Always Correct

Short Answer

Which of the following statements is always correct? $$\begin{array} { l l } \text { A. } & P ( A \frown B ) = P ( A ) \times P ( B ) \\\hline \text { B. } & P ( A \cup B ) = P ( A ) + P ( B ) \\\hline \text { C. } & P ( A \cup B ) = P ( A ) + P ( B ) + P ( A \frown B ) \\\hline \text { D. } & P ( A ) = 1 - P ( A ) \\\hline\end{array}$$