Two independent events A and B have \({\rm{P}}\left( {\rm{A}} \right) = \frac{1}{3}\) and \({\rm{P}}\left( {\rm{B}} \right) = \frac{3}{4}\). What is the probability that exactly one of the two events A or B occurs?

• A. \(\frac{1}{4}\)
• B. \(\frac{5}{6}\)
• C. \(\frac{5}{{12}}\)
• D. \(\frac{7}{{12}}\)