Let A and B be two independent events such that P ( A ) = 0.4 and P ( B ) = 0.5 . The probability that A or B occurs is: \begin{tabular}{|} \hline 0.52 \\ \hline 0.46 \\ \hline 0.64 \\ \hline 0.90 \\ \hline 0.70 \\ \hline \end{tabular}