Question: During the T2 period, what is the latest slot by which a UE must send its first valid CSI report (non-zero CQI) for an SCell, given that uplink resources are available?
Option 1: Slot m + (THARQ+Tactivation_time_withCCA + TCSI_Reporting_withCCA)/NR_slot_length
Option 2: Slot m + 1 + THARQ/NR_slot_length
Option 3: Slot n + 1 + (THARQ + 3ms)/NR_slot_length
Option 4: Immediately after the first CSI-RS transmission occasion for channel measurement
Explanation: According to specifications, the UE must send its first valid CSI report for the SCell in the first available uplink resource no later than a calculated slot based on several timing parameters, ensuring timely reporting of channel quality for the Secondary Cell (SCell) during its activation phase.