Suppose a politician is in charge to spending public funds. he can give a contract to a company that is not the best bidder, or allocate more than they deserve. in this case, the company benefits, and in exchange for betraying the public, the official receives an amount of money, which is a portion of the sum the company received. a rival politician comes to know about this. he plans an exposure not for the public good but to defame the guilty party and win the votes of the electorate. this is an example of: