The signal $m(t)$ as shown is applied both to a phase modulator (with $k_p$ as the phase constant) and a frequency modulator (with $k_f$ as the frequency constant) having the same carrier frequency.

The ratio $\frac{k_p}{k_f}$ (in $rad/Hz$) for the same maximum phase deviation is

1. $8\pi$
2. $4\pi$
3. $2\pi$
4. $\pi$
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