Let the universal set $U = \mathbb{R}$, set $M = \{ x \mid x < 1 \}$, $N = \{ x \mid - 1 < x < 2 \}$, then $\{ x \mid x \geqslant 2 \} =$ A. $C _ { U } ( M \cup N )$ B. $N \cup C _ { U } M$ C. $C _ { U } ( M \cap N )$ D. $M \cup C _ { U } N$
Let the universal set $U = \mathbb{R}$, set $M = \{ x \mid x < 1 \}$, $N = \{ x \mid - 1 < x < 2 \}$, then $\{ x \mid x \geqslant 2 \} =$\\
A. $C _ { U } ( M \cup N )$\\
B. $N \cup C _ { U } M$\\
C. $C _ { U } ( M \cap N )$\\
D. $M \cup C _ { U } N$