The core revenue principle states that: a. Companies recognize revenue when the goods or services are transferred to the customer in an arm's length transaction. b. Companies recognize revenue when goods or services are transferred to customers for the amount the company expects to be entitled to receive in exchange for those goods or services. c. Companies recognize revenue when goods or services are transferred to the customer and payments are received. d. Companies recognize revenue when the earnings process is virtually complete and it is probable that payments will be received.