Which expression shows 27 + 36 as the product of their greatest common factor and the sum of two whole numbers with no common factor? ​A. 9(3+4)9(3+4) ​ ​ B.9(4+5)9(4+5) ​ ​ C.7(4+5)7(4+5) ​ ​ D.
7(3+6)7(3+6) ​