Identify the mathematical expression for amplitude modulated wave:

$A_{C} \sin \left[\left\{w_{C}+K_1 v_{m}(t)\right\} t+\phi\right]$

$A_{C} \sin \left\{w_{C}t + \phi +K_2 v_{m}(t)\right\}$

$\left\{A_{C}+K_2 v_{m}(t)\right\} \sin \left(w_{C} t+\phi\right)$

$A_{C}{ } v_{m}(t) \sin \left(w_{C} t+\phi\right)$