Question: What is the primary condition for the presence of the `discSupportedProc-r12` parameter in a User Equipment (UE) radio access capabilities declaration?
Option 1: If the UE supports at least one frequency band for LTE TDD operation.
Option 2: If sidelink discovery is not supported on any band to explicitly indicate this lack of support.
Option 3: If the UE has a specific capability for handling multiple simultaneous voice calls.
Option 4: If sidelink discovery is supported on at least one band (as indicated by `discSupportedBands-r12`)
Explanation: The correct answer, Option 4, directly relates to the condition specified in the 3GPP standard for the presence of `discSupportedProc-r12`, emphasizing that this parameter is only included if the UE supports sidelink discovery on at least one band. This is crucial for network planning and device capability exchange, as it informs the network about the UE’s ability to receive sidelink discovery signals across different bands. The other options are incorrect because they either refer to unrelated capabilities (Options 1 and 3) or misinterpret the condition for the parameter’s presence (Option 2).