The two circles $x^{2}+y^{2}=a x$ and $x^{2}+y^{2}=c^{2}(c>0)$ touch each other if :-
a = 2c
$|\mathrm{a}|=2 \mathrm{c}$
$|2| \mathrm{a} \mid=\mathrm{c}$
$|\mathrm{a}|=\mathrm{c}$
Correct Option: , 4
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