Question: Which of the following network entity identifiers in E-UTRAN is constructed from the PLMN identity, group identity of the MME group, and the MME code (MMEC)?
Option 1: eNB Identifier (eNB ID)
Option 2: Globally Unique MME Identity (GUMMEI)
Option 3: E-UTRAN Cell Global Identifier (ECGI)
Option 4: Tracking Area identity (TAI)
Explanation: The correct answer is GUMMEI because it is uniquely constructed from three key components: the Public Land Mobile Network (PLMN) identity, the group identity of the MME group, and the MME code (MMEC), ensuring global uniqueness for identifying an MME in the E-UTRAN network.