Which Rule Is Used in the Following Inference $\frac { ( \mathrm { D } \cdot \mathrm { F } ) \cdot ( \mathrm { K } \vee \mathrm { L } ) } { \mathrm { K } \vee \mathrm { L } }$

Multiple Choice

Which rule is used in the following inference? $\frac { ( \mathrm { D } \cdot \mathrm { F } ) \cdot ( \mathrm { K } \vee \mathrm { L } ) } { \mathrm { K } \vee \mathrm { L } }$

A) Simp
B) Conj
C) Add
D) DS
E) HS