Question: When `drb-TypeLWIP` is set to `lwip` and `lwip-DL-Aggregation` is set to `TRUE`, what action should the UE indicate to higher layers for both LTE and WLAN Downlink (DL) reception for the associated DRB?
Option 1: Insert LWIPEP header with GRE sequence number
Option 2: Stop decoding of LWIPEP header with GRE sequence number
Option 3: Use EUTRAN resources exclusively
Option 4: Apply decoding of LWIPEP header with GRE sequence number
Explanation: According to the specified conditions, when `drb-TypeLWIP` is set to `lwip` (indicating use of LWIP resources in both UL and DL) and `lwip-DL-Aggregation` is set to `TRUE`, the UE should indicate to higher layers to apply decoding of LWIPEP header with GRE sequence number for both LTE and WLAN Downlink (DL) reception. This ensures proper handling of aggregated traffic in the downlink direction.