Which Rule Is Used in the Following Inference $$\begin{array} { l } \sim ( A \equiv B )\supset( A \cup C ) \\\sim ( A \cup C ) \\\sim ( A \equiv B )\end{array}$$

Multiple Choice

Which rule is used in the following inference? $$\begin{array} { l } \sim ( A \equiv B ) \supset( A \cup C ) \\\sim ( A \cup C ) \\\sim ( A \equiv B ) \end{array}$$

A) HS
B) MP
C) MT
D) CD
E) DD