The waveform created by connecting the peak values of the modulated signal✓پاسخ درست
The carrier frequency that contains the signal
Spurious signals that envelop nearby frequencies
The bandwidth of the modulated signal
توضیح
The envelope is the outline traced by the peak amplitudes of the modulated RF, and for undistorted AM that outline reproduces the modulating waveform. It is a time-domain shape, not the carrier itself and not a bandwidth figure.