The leading US automaker, General Motors adds greater value to its range of luxury cars through satellite-based services that are delivered with a network of service providers. For example, in case of a medical emergency the driver's health service providers, ambulance services will be contacted while hospital staff will have ready access to his/her medical history info. With these added services, GM has been able differentiate these cars from those of competitors. This is an example of (select the most appropriate answer); A. Customer relationship management B. Service infusion C. Servitization D. Delivery of services with a network of providers