Position of an ant (S in metres) moving in $$Y - Z$$ plane is given by $$S = 2t^2 \hat{j} + 5\hat{k}$$ (where $$t$$ is in second). The magnitude and direction of velocity of the ant at $$t = 1$$ s will be :

A

$$16 \text{ m s}^{-1}$$ in y-direction

B

$$4 \text{ m s}^{-1}$$ in x-direction

C

$$9 \text{ m s}^{-1}$$ in z-direction

D

$$4 \text{ m s}^{-1}$$ in y-direction