An object is moving along the x$-$axis. Its position at any time is given by x$($t$)=3$cos$($t$)+2$x$($t$)=3$cos$($t$)+2.$ Find its acceleration.

A$.$a$($t$)=3$$$sin$($t$)$a$($t$)=3$$$sin$($t$)$

B$.$a$($t$)=3$sin$($t$)+2$a$($t$)=3$sin$($t$)+2$

C$.$a$($t$)=3$cos$($t$)$a$($t$)=3$cos$($t$)$

D$.$a$($t$)=3$sin$($t$)$a$($t$)=3$sin$($t$)$

E$.$a$($t$)=3$$2$cos$($t$)$a$($t$)=3$$2$cos$($t$)$