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(A) The modulation index is defined as $\mu = \frac{A_m}{A_c}$,where $A_m$ is the amplitude of the message signal and $A_c$ is the amplitude of the ca

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$\mu \leq 1$

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(A) The modulation index is defined as $\mu = \frac{A_m}{A_c}$,where $A_m$ is the amplitude of the message signal and $A_c$ is the amplitude of the carrier wave.To avoid distortion in the amplitude modulated wave,the modulation index must satisfy the condition $\mu \leq 1$.If $\mu > 1$,over-modulation occurs,which leads to the distortion of the signal and interference between the carrier frequency and the message frequency.

In the case of amplitude modulation,to avoid distortion,the modulation index $(\mu)$ should be:

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