If $$3 \cot A = 4 \tan A$$ and A is an acute angle, then what will be the value of $$\sec A$$?

A

$$\frac{\sqrt{7}}{2}$$

B

$$\frac{\sqrt{21}}{3}$$

C

$$\frac{1}{\sqrt{3}}$$

D

$$\frac{1}{2}$$