For an AM-system the total power of modulated signal is \( 600 \mathrm{~W} \) and that of carrie...

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For an AM-system the total power of modulated signal is \( 600 \mathrm{~W} \) and that of carrier is \( 400 \mathrm{~W} \), the modulation index is
(a) \( 0.25 \)
(b) \( 0.36 \)
(c) \( 0.54 \)
(d) 1
\( \mathrm{W} \)
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