Use $\subseteq, \nsubseteq, \subset$ , or Both $\subset$

Multiple Choice

Use $\subseteq, \nsubseteq, \subset$ , or both $\subset$ and $\subseteq$ to make a true statement.
- $\{ 6,7,8 \}$ ____ $\{ 6,7,8 \}$

A) $\subseteq$
B) $\subset$
and $\nsubseteq$
C) $\subset$

D) $\nsubseteq$