For carrier aggregation, which of the following conditions does the downlink service satisfy at the same time, Scell is activated? (Multiple choice)

For carrier aggregation, which of the following conditions does the downlink service satisfy at the same time, Scell is activated? (Multiple choice)
A . RLC first packet delay is greater than the set threshold
B . Pcell ‘s RSRP is above the set threshold
C . Scell ‘s RSRP is above the set threshold
D . RLC cache data volume is greater than the set threshold

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Answer: AD