Angle made by $$2i - 3j + 4k$$ with the z-axis is

A

$$\cos^{-1}\left(\frac{4}{\sqrt{29}}\right)$$

B

$$\frac{4}{\sqrt{29}}$$

C

$$\sin^{-1}\left(\frac{4}{\sqrt{29}}\right)$$

D

$$\tan^{-1}\left(\frac{4}{\sqrt{29}}\right)$$