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If \( z_{1} \) and \( z_{2} \) lie on the same side the line \( \bar{a} z+a \bar{z}+b \) \( =0 \), where \( a \in \mathbf{C}, a \neq 0, b \in \mathbf{R} \), then the ratio \( \frac{\bar{a} z_{1}+a \bar{z}_{1}+b}{\bar{a} z_{2}+a \bar{z}_{2}+b} \) is
(a) purely imaginary
(b) a positive real number
(c) a negative real number
(d) none of these
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