Question: In a Mission Critical (MC) service architecture, what is the possible relationship between an MC Service ID and Public User Identities?
Option 1: One-to-One: An MC Service ID is always mapped to a single Public User Identity.
Option 2: Many-to-Many: An MC Service ID can be mapped to multiple Public User Identities, and a Public User Identity can be mapped to multiple MC Service IDs.
Option 3: One-to-Many: An MC Service ID can only be mapped to multiple Public User Identities, but not vice versa.
Option 4: Hierarchical: An MC Service ID is always a subset of a single Public User Identity.
Explanation: This correct answer reflects the nuanced relationship defined in telecom standards for MC services. The Many-to-Many relationship accurately captures the complexity of mappings between MC Service IDs and Public User Identities, such as scenarios involving multiple UEs, shared UEs, UE-to-network relay, or users sharing the same UE, highlighting flexibility and manageability required in mission-critical communications.