Question: What is the primary purpose of the `suppressPrefCUG` identifier in a mobile network?
Option 1: To enable preferential Closed User Group (CUG) services for a mobile subscriber.
Option 2: To request the network to allow Outgoing Calls (OC) without restrictions.
Option 3: To prohibit the use of preferential CUG services at the request of the mobile subscriber.
Option 4: To indicate to the mobile station that a Calling Line Identification Restriction (CLIR) request has been accepted.
Explanation: The `suppressPrefCUG` identifier is specifically used for a mobile subscriber to request the network to prevent the use of preferential Closed User Group (CUG) services, respecting the subscriber's preference to avoid using these services within a closed group.