已知圆 C1:(x+1)2+(y−1)2=1，圆 C2 与圆 C1 关于直线 x−y−1=0 对称，则圆 C2 的方程为(       )

A：${\left(x+2\right)}^2$ + ${\left(y-2\right)}^2$ =1

B：${\left(x-2\right)}^2$ + ${\left(y-2\right)}^2$ =1

C：${\left(x+2\right)}^2$ + ${\left(y+2\right)}^2$ =1

D：${\left(x-2\right)}^2$ + ${\left(y+2\right)}^2$ =1