Question: What is the primary condition for a User Equipment (UE) to support the feature defined in the e-CSFB-ConcPS-Mob1XRTT field?
Option 1: The UE must support only CDMA2000 HRPD.
Option 2: The UE must support LTE (E-UTRA) exclusively.
Option 3: The UE needs to have a specific frequency band allocated for CSFB.
Option 4: The UE must support both CDMA2000 1xRTT and CDMA2000 HRPD simultaneously.
Explanation: This feature requires the UE to utilize concurrent enhanced CS fallback to CDMA2000 1xRTT and handover/redirection to CDMA2000 HRPD. The correct answer reflects the necessity for dual support, highlighting the importance of simultaneous compatibility for seamless handovers and fallbacks between different radio access technologies (RATs), maintaining service continuity across heterogeneous network environments.