Boolean Query

ColumnA ColumnB ColumnC ColumnD
0                0                12
0                0                12
0                0                12
0                1                12

I want to write a boolean string in ColumnD which is a formula. in that i want to say If COLUMNA and COLUMNB are 0, then Multiply ColumnC by 0 Otherwise keep the value what ever shows in ColumnC.

Result:

ColumnA ColumnB ColumnC ColumnD
0                0                12                 0
0                0                12                 0
0                0                12                 0
0                1                12                 12