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.
-∼{[(H ⊃ I) ⊃ ∼(I $\lor$ ∼J) ] ⊃ (∼H ⊃ J) }

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 ≡.
C) It's a wff. The main operator is the second $\lor$ , reading left to right.
D) It's a wff. The main operator is the •.
E) Not a wff