Question: What is the primary purpose of implementing EIA0 algorithm in a 3GPP network, considering its impact on security features?
Option 1: To provide an additional layer of encryption for authenticated User Equipment (UE) in Long Term Evolution (LTE) networks.
Option 2: Exclusively for emergency calling by unauthenticated UEs in Limited Service Mode (LSM), without activating replay protection.
Option 3: To enhance integrity protection for all types of UE, including those with 2G SIMs, in E-UTRAN.
Option 4: As a default ciphering algorithm for all UEs lacking specific security protocols.
Explanation: The correct answer is Option 2 because EIA0 is used only for emergency calling for unauthenticated UEs in Limited Service Mode (LSM), and it does not activate replay protection, highlighting a balance between accessibility and security in network design.