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; d. y = (a * x) * x * (x + 7); e. y = a * x * (x * x + 7); f. y = (a * x) *( x * x) + 7;