Question: What level of granularity should the 5G network support for energy consumption monitoring, subject to operator's policy?
Option 1: Only at a per-network level
Option 2: Only at a per-subscriber level, but only for specific services
Option 3: At a per-network slice and per-subscriber level, but without granularity for subscription policies
Option 4: At both per-network slice and per-subscriber granularity, with the option to apply to all services or particular services
Explanation: The correct answer is Option 4 because the 5G network should support energy consumption monitoring at both per-network slice and per-subscriber granularity, subject to operator's policy. This allows for flexible monitoring options, including applying to all services or specific services, as stated in the requirement.