集合 $A=\left\{\overline{)x}-1\le x\le 2\right\},B=\left\{\overline{)x}x<1\right\}$ ,则 $A\cap \left(C_{R}B\right)=$ （  ）

A．

$\left\{\overline{)x}x>1\right\}$

B．

$\left\{\overline{)x}x\ge 1\right\}$

C．

$\left\{\overline{)x}1<x\le 2\right\}$

D．

$\left\{\overline{)x}1\le x\le 2\right\}$