Question: What is the purpose of prepending a specific leading digit to the Root NAI when used for EAP (Extensible Authentication Protocol) authentication in EPS (Evolved Packet System)?
Option 1: To indicate the type of mobile device being used.
Option 2: To differentiate between various EAP authentication methods (e.g., EAP-AKA, EAP-AKA').
Option 3: To specify the preferred network for the authentication process.
Option 4: To enhance encryption for the authentication exchange.
Explanation: In the context of EPS and EAP authentication, prepending a specific leading digit to the Root NAI serves to distinguish between different EAP authentication methods, ensuring seamless and secure access to services by facilitating correct processing and handling of authentication requests.