Let $U = \{ 5,6,7,8,9,10,11,12,13,14,15 \}$
$$\begin{aligned}
X & = \{ 5,7,9,11,13,15 \} \
Y & = \{ 5,6,7,8,9,10 \} \
Z & = \{ 6,8,9,10,13,14,15 \} .
\end{aligned}$$
Find $( X \cap Y ) \cap Z$.
A) $( X \cap Y ) \cap Z = \{ 5,6,7,8,9,10,11,12,13,14,15 \}$
B) $( X \cap Y ) \cap Z = \{ 5,6,7,8,9,10,11,13,14,15 \}$
C) $( X \cap Y ) \cap Z = \varnothing$
D) $( X \cap Y ) \cap Z = \{ 9 \}$

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The Answer of Let $U = \{ 5,6,7,8,9,10,11,12,13,14,15 \}$
$$\begin{aligned}
X & = \{ 5,7,9,11,13,15 \} \
Y & = \{ 5,6,7,8,9,10 \} \
Z & = \{ 6,8,9,10,13,14,15 \} .
\end{aligned}$$
Find $( X \cap Y ) \cap Z$.
A) $( X \cap Y ) \cap Z = \{ 5,6,7,8,9,10,11,12,13,14,15 \}$
B) $( X \cap Y ) \cap Z = \{ 5,6,7,8,9,10,11,13,14,15 \}$
C) $( X \cap Y ) \cap Z = \varnothing$
D) $( X \cap Y ) \cap Z = \{ 9 \}$