I need help find question b

Suppose the cost function for a company is given by the following equation, where x is the number of units of phone chargers and y is the number of units of phone covers produced. Complete parts (a) and (b) below. C(x,y) = 600x + 150y + 4500 . . . .. (a) In C(x,y), what does 4500 represent? O A. 4500 represents the fixed cost, or the cost when 4500 phone chargers and phone covers have been produced. B. 4500 represents the fixed costs, or the cost when no items have been produced. O C. 4500 represents the marginal cost of producing one more phone charger when the number of phone covers is held constant. . O D. 4500 represents the marginal cost of producing one more phone cover when the number of phone chargers is held constant. ac ac (b) Find ax and ay What do these quantities represent? ac Get more help - Clear all Check answer Type here to search O