Factor 24 + 36x

Choose all the equivalent expressions.

a
4(6+9x)
b
2(12+18x)
c
6(4+6x)
d
12(2+3x)
e
(4+6x) +(4+6x) +(4+6x) +(4+6x) +(4+6x) +(4+6x)