Question: What is the identifier length for each UEA in 3GPP security architecture?
Option 1: 2-bit
Option 2: 4-bit
Option 3: 8-bit
Option 4: 16-bit
Explanation: According to the 3GPP TS 33.102, each UEA will be assigned a 4-bit identifier, which is used for encryption and other security purposes in the 3GPP network.