Question: What type of signaling does the Conditional PSCell Change Cancel procedure utilize when the MeNB informs the source en-gNB about cancelling all prepared PSCells in the target en-gNB?
Option 1: UE-associated signalling
Option 2: Non-UE associated signalling
Option 3: Control Plane signalling only
Option 4: User Plane signalling exclusively
Explanation: The correct answer is Option 1 because, according to the telecom protocol context, when a Master eNodeB (MeNB) notifies the source gNodeB (en-gNB) about cancelling all prepared Primary SCells (PSCells) in the target en-gNB during a handover scenario, it employs signalling linked to an active User Equipment (UE) connection, hence UE-associated signalling, crucial for managing seamless connectivity and resource allocation in E-UTRAN networks.