Point charges \( +4 q,-q \) and \( +4 q \) are kept on the \( x \)-axis at points \( x=0, x=a \)...

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Point charges \( +4 q,-q \) and \( +4 q \) are kept on the \( x \)-axis at points \( x=0, x=a \) and \( x=2 a \) respectively, then
[CBSE PMT 1992]
(a) Only \( -q \) is in stable equilibrium
(b) None of the charges are in equilibrium
(c) All the charges are in unstable equilibrium
(d) All the charges are in stable equilibrium
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