If $$(2a + 3b)(2c - 3d) = (2a - 3b)(2c + 3d)$$, then :

A

$$\frac{a}{b} = \frac{d}{c}$$

B

$$\frac{a}{b} = \frac{c}{d}$$

C

$$\frac{a}{d} = \frac{c}{b}$$

D

$$\frac{b}{a} = \frac{c}{d}$$