Which expression equals (a+b)3(a + b)^3(a+b)3?
a3+b3a^3 + b^3a3+b3
a3+3a2b+3ab2+b3a^3 + 3a^2b + 3ab^2 + b^3a3+3a2b+3ab2+b3
a3−3a2b+3ab2−b3a^3 - 3a^2b + 3ab^2 - b^3a3−3a2b+3ab2−b3
a3+2a2b+2ab2+b3a^3 + 2a^2b + 2ab^2 + b^3a3+2a2b+2ab2+b3