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If \( z_{1} \) and \( z_{2} \) are two non-zero complex numbers such that \( \left|z_{1}+z_{2}\right|=\left|z_{1}\right|+\left|z_{2}\right| \), then \( \arg \left(z_{1}\right)-\arg \left(z_{2}\right) \) is equal to
\( \mathrm{P} \)
(a) \( -\pi \)
(b) \( -\frac{\pi}{2} \)
(c) 0 (1987, 2M)
W
(d) \( \frac{\pi}{2} \)
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