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\( z_{1} \) and \( z_{2} \) are the roots of the equation \( z^{2}-a z+b=0 \), where \( \left|z_{1}\right|=\left|z_{2}\right|=1 \) and \( a, b \) are non-zero complex
P numbers, then

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(a) \( |a| \leq 1 \)
(b) \( |a| \leq 2 \)
(c) \( \arg (a)=\arg \left(b^{2}\right) \)
(d) \( \arg \left(a^{2}\right)=\arg (b) \)
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