High-level modulation is used: when the intelligence signal is added to the carrier at the last possible point before the transmitting antenna. in high-power applications such as standard radio broadcasting. when the transmitter must be made as power efficient as possible. all of the above.

Option d (all of the above) is the correct answer.

Explanation:

Such High-level modulation has been provided whenever the manipulation or modification of intensity would be performed to something like a radio-frequency amplifier.Throughout the very last phase of transmitting, this then generates an AM waveform having relatively high speeds or velocity.

Thus the above is the correct answer.

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Explanation: