What parameter can you modify on a pre-configured service?

A.
Protocol timeout

B.
Source port, Destination port and protocol

C.
Source port range, Destination port range, and protocol

D.
Source IP, Source port range, Destination IP, Destination port range, and protocol

Explanation:
Services are types of traffic for which protocol standards exist. Each service has a transport protocol and destination port number(s) associated with it, such as TCP/port 21 for FTP and TCP/port 23 for Telnet. When you create a policy, you must specify a service for it. You can select one of the predefined services from the service book, or a custom service or service group that you created. You can see which service you can use in a policy by viewing the Service drop-down List on the Policy Configuration page (WebUI), or by using the get service command (CLI). The only option you can change of a predefined service is the service timeout.