If $$a + b + c + d = 4$$, then the value of 

$$\frac{1}{(1 - a)(1 - b)(1 - c)} + \frac{1}{(1 - b)(1 - c)(1 - d)} + \frac{1}{(1 - c)(1 - d)(1 - a)} + \frac{1}{(1 - d)(1 - a)(1 - b)}$$ is

A

0

B

1

C

4

D

$$1 + abcd$$