Question: In the context of Cross-certification between two operators, what is the typical storage location for a SEG CA cross-certificate after it's created by the Interconnection CA?
Option 1: Exclusively on the User Equipment (UE) of subscribers
Option 2: Only in the local Certificate Repository (CR) of the requesting SEG CA
Option 3: In the local CR of the Interconnection CA, with retrieval via LDAP
Option 4: Solely on the Serving and Packet Data Network Gateway (S/P-GW)
Explanation: This is correct because, according to the cross-certification procedure, after the Interconnection CA creates a new cross-certificate, it stores the SEG CA cross-certificate in its local Certificate Repository (CR), and LDAP is utilized for fetching these cross-certificates, facilitating secure and centralized management of certificates between operators.