For Each of the Following Questions, Determine Whether the Given $\lor$

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.
-[(D ⊃ ∼E) • (F ⊃ E) ] ⊃ [D ⊃ (∼F $\lor$ G) ]

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