Given the algebraic equation: y=ax³+7

Which, if any, of the following are correct C++ statements for this equation? Note: there may be zero, one, or more correct statement(s). Circle any/all that apply.

a. y=(a∗x∗x)∗x+7;
b. y=a∗x∗x∗(x+7);
c. y=a∗(x∗x∗x)+7; (Correct) d. y=(a∗x)∗x∗(x+7);
e. y=a∗x∗(x∗x+7);
f. y=(a∗x)∗(x∗x)+7;