The transfer function of a compensator is given as $$G_c(s) = \frac{s+a}{s+b}$$

$G_c(s)$ is a lead compensator if

1. $a=1, \: b=2$
2. $a=3, \: b=2$
3. $a=-3, \: b=-1$
4. $a=3, \: b=1$
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