Determine the Union $\boldsymbol { X } \cup \boldsymbol { Y }$

Multiple Choice

Determine the union $\boldsymbol { X } \cup \boldsymbol { Y }$ . Express the answer in interval notation.
- $X = \{ x \mid x > 14 \}$ and $Y = \{ x \mid x \leq 11 \}$

A) { }
B) $[ 11,14 )$
C) $( 11,14 ]$
D) $( - \infty , 11 ] \cup ( 14 , \infty )$