Identify the mathematical expression for amplitude modulated wave:

1
Ac sin [{ωc + k1vm(t)}t + ϕ].
2
Ac sin {ωc t + ϕ + k2 vm(t)}.
3
{Ac + k2 vm(t)} sin (ωc t + ϕ).
4
Ac vm(t) sin (ωc t + ϕ).

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