Question: For which type of User Equipment (UE) is it mandatory to support height-based measurement reporting as per E-UTRA specifications?
Option 1: UEs with only Voice over LTE (VoLTE) subscription
Option 2: UEs with Aerial UE subscription for enhanced security features
Option 3: All UEs operating in low-density urban areas
Option 4: UEs with Aerial UE subscription as defined in General Packet Radio Service (GPRS) enhancements for E-UTRAN access
Explanation: The correct answer is based on the requirement specified in the context of E-UTRA radio access capabilities, where supporting height-based measurement reporting is mandatory specifically for UEs with an Aerial UE subscription. This is defined in standards related to GPRS enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access, highlighting the importance of this feature for aerial or drone-based UEs that require precise location and altitude measurements for safe and regulated operation.