Question: What is the primary purpose of the 'EPS Service' class in the context of Subscription Management (SuM) Network Resource Model (NRM)?
Option 1: To contain valid parameters defining an EPS service from a subscription perspective, provided by a service provider.
Option 2: To represent the technical capabilities of the Radio Access Network (RAN) for an EPS service.
Option 3: To manage the handover process between different EPS services for a subscriber.
Option 4: To store historical usage data of EPS services for billing purposes.
Explanation: The 'EPS Service' class is designed to hold the valid parameters that define an EPS (Evolved Packet System) service from the viewpoint of a subscription, which is provided by a service provider. This aligns with managing and understanding what services are offered to subscribers within the network.