Question: What is a specific requirement for the subjectAltName field with type dNSName in a vendor base station certificate, as per Network Domain Security (NDS) Authentication Framework (AF) specifications?
Option 1: It must contain a unique IP address of the base station.
Option 2: It shall contain the same Fully Qualified Domain Name (FQDN) as the subject field.
Option 3: It should include the vendor's CA website for certificate verification.
Option 4: It can be any domain name chosen by the network operator.
Explanation: This requirement ensures consistency between the subject field and the subjectAltName field in the certificate, enhancing authenticity and reducing potential misconfigurations. The FQDN's global uniqueness, ensured by the vendor, is crucial for secure identification of the base station within the network.