Given the algebraic equation y = ax3t 7, which of the following, if any, are correct C++ statements for this equation? 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)