Suppose a company has fixed costs of $42 and variable cost per unit of 7x +13 dollars, where x is the total number of units produced. Write a cost function C(x).a. C(x)=42+6x² +10xb. C(x)=42+7x²+ 13xc. C(x) = 42+2x² +15xd.C(x)=42+5x² + 12xe. C(x)=42+3x²+14x