Question: In a Network Domain Security (NDS) context, utilizing manual cross-certification as per the "Trust nobody unless explicitly allowed" trust model, what is primarily relied upon for ensuring the security of the certification process?
Option 1: Mutual Agreement between all Participating Networks
Option 2: Automated Certificate Verification Protocols
Option 3: Local Decision Making and Explicit Allowances
Option 4: External Third-Party Trust Anchors
Explanation: Manual cross-certification, guided by the "Trust nobody unless explicitly allowed" principle, inherently places the onus of security on the explicit allowances made through local decisions. This means that the security of the certification process primarily depends on the careful and deliberate choices made at the local level, rather than on external or automated processes. This approach highlights the importance of meticulous local oversight in ensuring the integrity of the trust framework within Network Domain Security.