Question: What is the primary purpose of the `maxLayersSlotOrSubslotPUSCH-r15` field in E-UTRA UE radio access capabilities?
Option 1: To specify the minimum bandwidth for PUSCH transmission in a slot or subslot.
Option 2: To define the maximum power output for UE during UL transmissions.
Option 3: To indicate the preferred modulation scheme for slot/subslot PUSCH.
Option 4: To limit the maximum number of layers for slot-PUSCH or subslot-PUSCH transmission in a band combination.
Explanation: The `maxLayersSlotOrSubslotPUSCH-r15` field caps the maximum number of layers for slot-PUSCH or subslot-PUSCH transmissions, impacting multiplexing capability and uplink throughput within a network's configured limits.