Question: What is the name of the feature supported by E-UTRAN/UTRAN and UE, as described in various 3GPP specifications, which allows for explicit notification of congestion in the network?
Option 1: Random Early Detection (RED)
Option 2: Explicit Congestion Notification (ECN)
Option 3: Weighted Random Early Detection (WRED)
Option 4: Proportional Integral Controller (PIC)
Explanation: The correct answer is Explicit Congestion Notification (ECN), which is a feature that allows for explicit notification of congestion in the network. ECN is supported by E-UTRAN/UTRAN and UE, as described in various 3GPP specifications, including TS 36.300, TS 25.401, and TS 26.114.