Question: Which of the following security features is NOT supported by E-UTRA connected to 5GC as part of NG-RAN?
Option 1: Access Control
Option 2: Data Integrity Protection
Option 3: Network Slicing Security
Option 4: 5G NAS Message Encryption
Explanation: According to the specifications for E-UTRA connected to 5GC, while it supports a comprehensive 5G security framework, there is a specific exception regarding the lack of support for data integrity protection. This indicates that among the provided options, data integrity protection stands out as the feature not supported. Access Control and Network Slicing Security are both part of the supported features, and 5G NAS Message Encryption would be implied under the broader security framework support, making Data Integrity Protection the correct answer due to its explicit exclusion.