For Each of the Following Questions, Determine Whether the Given

For each of the following questions, determine whether the given formula is a wff or not. If it is a wff, indicate its main operator.
-{∼R ⊃ [(Q • P) ⊃ S]}

A) It's a wff. The main operator is the ∼.
B) It's a wff. The main operator is the first ⊃, reading left to right.
C) It's a wff. The main operator is the •.
D) It's a wff. The main operator is the second ⊃, reading left to right.
E) Not a wff

Correct Answer:

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