Let # be a binary operator defined asX # Y = X’ + Y’ where X and Y are Boolean variables.Consider the following two statements.(S1) (P # Q) #R = P# (Q # R)(S2) Q # R = R # QWhich of the following is/are true for the Boolean variables P, Q and R?

• A. Only S1 is true
• B. Only S2 is true
• C. Both S1 and S2 are true
• D. Neither S1 nor S2 are true