Question: In a Network Domain Security (NDS) Authentication Framework using direct cross-certification, what is implied by the LocalCA's cross-certifications regarding access control for foreign operators?
Option 1: The need for an additional 'AllowedCertificateSigner' limitation to restrict access.
Option 2: Implicit information on which operator is allowed access to specific subnetworks.
Option 3: The requirement for a Bridge CA solution for all foreign operators.
Option 4: The necessity of separate PKI products for each foreign operator.
Explanation: In the context of direct cross-certification within NDS's Authentication Framework, the act of cross-certifying an operator by the LocalCA inherently implies trust and access rights. This means that the information regarding which operators are allowed access to specific subnetworks is embedded within the cross-certification process itself, making access control tightly connected to authentication.