Identify the mathematical expression for...

Identify the mathematical expression for amplitude modulated wave.

`A_(c) sin [{omega_(c) + k_(1) upsilon_(m) (t) } t + phi]`

`A_(c) sin {omega_(c) t + phi + k_(2) upsilon_(m) (t)}`

`{A_(c) + k_(2) upsilon_(m) (t) } sin (omega_(c) t + phi)`

`A_(c) upsilon (t) sin (omega_(c) t + phi)`

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