Proposition 2H Given the Following Proposition

Multiple Choice

Proposition 2H
Given the following proposition:
∼[(B • ∼X) ⊃ ∼(Y ≡ ∼B) ] ⊃ [∼(X ⊃ A) ∨ (B ⊃ ∼Y) ]
-In Proposition 2H, the main operator is a:

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