Mark works in sales company X and is paid a commission on his sales. After negotiations he enters into a contract to sell a product to a customer at a price that is much higher than other sales people could negotiate. His boss sends Mark an email stating that she is very pleased with the deal. Despite the high price, the customer is also pleased with the deal and pays Mark a bonus. When Mark's company later learns about the bonus the company (select one)

can refuse to pay commission because the unconscionability rule

can refuse to pay his commission because of the fraud rule

can refuse to pay his commission because of the fiduciary duty rule

can refuse to pay his commission because of the Golden Rule

in this situation, must pay commision

none of the above