Suppose that the profit maximizing level of output for the monopolist is 100​ units, and atc​ = $45.00; mc​ = $35.00; mr​ = $35.00; p​ = $45.00. what is the​ monopoly's profit?
a. minus−​$1000
b. ​$4500
c. ​$0
d. ​$3500