If $$\frac{22\sqrt{2}}{4\sqrt{2} - \sqrt{3 + \sqrt{5}}} = a + \sqrt{5}b$$, with a, b > 0, then what is the value of $$(ab):(a + b)?$$

A

7 : 8

B

7 : 4

C

4 : 7

D

8 : 7