Which ONE of the following would list the names of all the services and the number of lines that subscribe to that service? Select one: a. T[service, num_services](services * (service f count portid(service_subscribers))) b. SERVICE_COUNT(scode, num_services) = (service f count portid(service_subscribers)) TI[service,num_services](services * SERVICE_COUNT) C. SERVICE_COUNT(scode, num_services) = (service f count portid(service_subscribers)) T[name, num_services](subscribers * SERVICE_COUNT) d. Tt[service, num_services] ((service f count portid(service_subscribers))) e. SERVICE_COUNT(service, num_services) = (service f count portid(service_subscribers)) TI[service,num_services](services * SERVICE_COUNT)