Question: What triggers the start of the `sl-IUC-ReportTimer` in the MAC entity for Sidelink Inter-UE Coordination Information reporting, assuming it's not already running?
Option 1: Receipt of a Sidelink Inter-UE Coordination Request MAC CE and simultaneous expiration of another timer related to a different PC5-RRC connection.
Option 2: Configuration of the `sl-LatencyBoundIUC-Report` parameter by RRC for a new PC5-RRC connection, without any explicit request reception.
Option 3: Receipt of a Sidelink Inter-UE Coordination Request MAC CE (and/or an SCI) and the sl-IUC-ReportTimer for the triggered SL-IUC Information reporting is not currently running.
Option 4: Establishment of a new PC5-RRC connection by upper layers, without any specific request or condition triggering the report.
Explanation: The `sl-IUC-ReportTimer` starts if SL-IUC Information reporting is triggered by an SL-IUC Request MAC CE (and/or an SCI), hasn't been cancelled, and its timer isn't already running, ensuring adherence to the signaled latency requirement from the triggering UE.