Question: In E-UTRA, for CSI-RS density reduction, what are the supported density values respectively for non-precoded and beamformed CSI-RS as indicated by the `densityReductionNP-r14` and `densityReductionBF-r14` UE capabilities?
Option 1: Non-precoded: 1/2, Beamformed: 1/3, 1
Option 2: Non-precoded: 1, 1/2, 1/3; Beamformed: same as non-precoded (values of 1, 1/2, and 1/3)
Option 3: Non-precoded: 1/4, Beamformed: 1/2
Option 4: Non-precoded: 1 only; Beamformed: 1/2 only
Explanation: The correct answer reflects the understanding that both non-precoded and beamformed CSI-RS have the capability for density reduction with values of 1, 1/2, and 1/3 as per the UE's indicated capabilities (`densityReductionNP-r14` and `densityReductionBF-r14`). This is crucial in E-UTRA for efficient use of resources in different transmission modes (like TM9, TM10), impacting network performance and user experience.