Question: What is the significance of the GAA-Service-Identifier (GSID) AVP in the context of a Bootstrapping Server Function (BSF) interacting with a Network Application Function (NAF), specifically for 3GPP standardized services?
Option 1: It informs the NAF about the BSF's support for a specific GAA service, enabling the NAF to adjust its security settings accordingly.
Option 2: It allows the BSF to authenticate the NAF before granting access to non-standardized GAA services.
Option 3: It enables the BSF to select the appropriate user security settings based on the support of a GAA-service indicated by the NAF, for standardized services identified by codes in the range 0 to 999999.
Option 4: It facilitates the NAF to prioritize GAA services based on the GSID values provided by the BSF for customized service offerings.
Explanation: The correct answer is Option 3 because the GAA-Service-Identifier AVP informs a BSF about the NAF's support of a GAA-service, crucial for selecting the right user security settings, particularly for 3GPP standardized services within the specified GSID range.