Question: For a User Equipment (UE) to support NRSRP validation for FDD, which of the following additional capabilities MUST also be supported by the UE?
Option 1: Only `pur-CP-EPC-r16`
Option 2: Either `pur-CP-EPC-r16`, `pur-CP-5GC-r16`, `pur-UP-EPC-r16`, or `pur-UP-5GC-r16`
Option 3: Both `pur-CP-EPC-r16` and `pur-UP-5GC-r16` simultaneously
Option 4: None of the above; NRSRP validation for FDD has no dependency on these capabilities
Explanation: According to the specifications, a UE indicating support for `pur-NRSRP-Validation-r16` (NRSRP validation for FDD) must also indicate support for at least one of the following: `pur-CP-EPC-r16`, `pur-CP-5GC-r16`, `pur-UP-EPC-r16`, or `pur-UP-5GC-r16`. This ensures compatibility with various core network architectures (EPC for 4G and 5GC for 5G, as well as user plane optimizations). The correct answer reflects this requirement for flexibility in core network support.