If the inequality $kx^2 -2x + k \geq 0$ holds good for atleast one real $'x'$ , then the complete set of values of $'k'$ is
If the inequality $kx^2 -2x + k \geq 0$ holds good for atleast one real $'x'$ , then the complete set of values of $'k'$ is
- A
$[-1,1]$
- B
$\left( { - \infty ,1} \right]$
- C
$\phi $
- D
$\left( { - 1,\infty } \right]$
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