AMC 10A 2008 Problem 3

For the positive integer n, let <n> denote the sum of all the positive divisors of n with the exception of n itself. For example, <4>=1+2=3 and \langle 12\rangle= 1+2+3+4+6=16. What is <<<6>>> ?

Answer Choices
A. 6
B. 12
C. 24
D. 32
E. 36