Question: What is a key characteristic of an Interconnection CA certificate's lifetime in relation to other certificates, as per Network Domain Security (NDS) guidelines?
Option 1: It must be shorter than all other certificates to ensure frequent security updates.
Option 2: Its lifetime is irrelevant to the lifetimes of other certificates in the network.
Option 3: It shall have a longer lifetime than other certificates to minimize cross-certification renewal actions.
Option 4: It must match the exact lifetime of the operator's top-level CA certificate.
Explanation: Having an Interconnection CA certificate with a longer lifetime than other certificates is crucial for reducing the administrative burden and security risks associated with frequent cross-certification updates. This approach ensures continuity and stability in inter-operator connections, aligning with the principles of Network Domain Security (NDS) for efficient and secure telecommunications operations.