Question: For a User Equipment (UE) to support HARQ feedback disabling per HARQ process for downlink transmission via RRC configuration, which of the following must also be supported by the UE?
Option 1: ue-category-M and ntn-Connectivity-EPC-r15
Option 2: ue-category-NB and ntn-Connectivity-EPC-r17
Option 3: ue-category-L and ntn-Connectivity-EPC-r16
Option 4: Only ntn-RRC-HarqDisableSingleTB-r18
Explanation: This is because the feature of HARQ feedback disabling per HARQ process for downlink transmission by RRC configuration, as specified, is only applicable if the UE supports ue-category-NB. Additionally, support for ntn-Connectivity-EPC-r17 is also mandated for UEs that support this feature, making Option 2 the correct and comprehensive answer.