As carrier wave, \[ \begin{array}{l} c_{m}(t)=A_{c} \sin \omega_{c...

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As carrier wave,
\[
\begin{array}{l}
c_{m}(t)=A_{c} \sin \omega_{c} t+\frac{\mu A_{c}}{2} \cos \left(\omega_{c}-\omega_{m}\right) t \\
-\mu A_{c} / 2 \cos \left(\omega_{c}+\omega_{m}\right) t
\end{array}
\]
In the given equation, \( \left(\omega_{c}-\omega_{m}\right) \) and \( \left(\omega_{c}+\omega_{m}\right) \) are
(a) upper side frequency, lower side frequency
- (b) lower side frequency, lower side frequency
_ (c) upper side frequency, lower side frequency
(d) lower side frequency, upper side frequency
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