In order to prove this proposition: (P(x)?Q(x))?(R(x)?Q(x)), you must prove which of the following propositions? Select all (if any) that apply.

A) (Q(x)?P(x))?(R(x)?Q(x))

B) (Q(x)?P(x))?(R(x)?Q(x))

C) (Q(x)?P(x))?(R(x)?Q(x))

D) (R(x)?Q(x))?(P(x)?Q(x))

E) (R(x)?Q(x))?(P(x)?Q(x))

F) All of the Above

G) None of The Above