If $$3 \cos^2 \theta - 4 \sin \theta + 1 = 0, 0^\circ < \theta < 90^\circ$$, then $$\tan \theta + \sec \theta = ?$$

A

$$2\sqrt{5}$$

B

$$2\sqrt{3}$$

C

$$3\sqrt{3}$$

D

$$\sqrt{5}$$