A middleman is a person who

a. specializes in arranging trades and selling, guaranteeing, and servicing items traded.
b. acts as a middle person between the top management of a business firm and the hourly employees who actually produce the goods and services.
c. adds to the seller's expense and the buyer's buying price without providing a service to either.
d. levies a tax on private sector activity and uses the funds to support government activities.

A