Which of the following describes how brokers/licensees go about obtaining their commission? A) Brokers/licensees earn commission by simply signing a contract with a client. B) Brokers/licensees receive a commission only if the client purchases the most expensive option. C) Brokers/licensees earn a commission based on the successful completion of a transaction or sale. D) Brokers/licensees receive their commission upfront, regardless of the outcome of the transaction.