If a $-6\mathrm{.}00C$ charge is placed at $x=0\mathrm{.}00cm$ and $a-2\mathrm{.}00C$ is placed at $x=20\mathrm{.}0cm,$ excluding $x=\frac{+}{-},$ where could an electric field of zero exist?

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At locations: $x<mn>0</mn><mn>.</mn><mn>0</mn><mn>0</mn><mi>c</mi><mi>m</mi>$

At locations: $x>20\mathrm{.}0cm$

At locations: $0\mathrm{.}00cm$