Question: Which of the following best describes the primary functionality of the Customized Alerting Tone Service (CAT) in a telecom network?
Option 1: Enables subscribers to restrict incoming communications from specified groups or individuals.
Option 2: Allows operators to customize the alerting tone played to the calling party for their subscribers.
Option 3: Facilitates the formation of closed user groups with restricted communication profiles.
Option 4: Provides additional capabilities for outgoing calls to international numbers.
Explanation: The correct answer, Option 2, accurately reflects the primary functionality of the Customized Alerting Tone Service (CAT). It highlights the service's key feature: enabling operators to offer customizable alerting tones for subscribers, which are played to the calling party. This showcases an understanding of value-added services in telecom networks and their impact on user experience. Option 1 relates more closely to CUG functionality, Option 3 also describes CUG, not CAT, and Option 4 introduces a concept (international calls) not related to the provided context of CAT.