Decide Whether $\subset$ $\subseteq$ , Both, or Neither Can Be Placed in the Blank

Multiple Choice

Decide whether $\subset$ , $\subseteq$ , both, or neither can be placed in the blank to make a true statement.
- $\{ 5,6,7 \} \ldots \{ 5,6,7 \}$

A) $\subset$
B) Both $\subset$ and $\subseteq$
C) Neither
D) $\subseteq$