In a service triad: a. the buyer is dependent on the supplier for customer service innovation and organizational learning. b. the buyer is dependent on the supplier for the satisfactory fulfillment of customers' service demands. c. the service supplier and customers are the coproducer of the service, excluding the buyer from the service encounter, and the buyer is dependent on the supplier for the satisfactory fulfillment of customers' service demands. d. the service supplier and customers are the coproducer of the service, excluding the buyer from the service encounter; the buyer is dependent on the supplier for the satisfactory fulfillment of customers' service demands; and the buyer is dependent on the supplier for customer service innovation and organizational learning