Chad is a monopolist and sells pies. Chad's cost function is c(y)=y, MC(y)=1, and the inverse demand function for pies is p(y)=9-y, where p is price and y is the number of pies. If the government imposes a quantity tax of $2 per pie on Chad, what level of output will maximize Chad's profit?

Group of answer choices

3

neither one is correct

5

7

4