Proposition 1C Given the Following Proposition

Multiple Choice

Proposition 1C
Given the following proposition:
∼{[(B ≡ ∼ X) ⊃ Y] ∨ [∼ X ⊃ (A ⊃ Y) ]}
-In Proposition 1C, the main operator is a:

A) Dot.
B) Horseshoe.
C) Wedge.
D) Triple bar.
E) Tilde.