If the line $x = k$ touches the circle ${x^2} + {y^2} = 9$, then the value of $k$ is
If the line $x = k$ touches the circle ${x^2} + {y^2} = 9$, then the value of $k$ is
- A
$2$ but not $-2$
- B
$-2$ but not $2$
- C
$3$
- D
None of these
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