Which statement is true about the digital certificate's CA's Distinguished Name (DN)?

The Distinguished Name (DN) of a Certificate Authority (CA) is a critical component in understanding digital certificates. The DN typically contains a collection of attributes that collectively identify the CA. These attributes can include the common name (CN), organization (O), organizational unit (OU), country (C), and others, thereby providing a unique identity for the CA in a hierarchy of trust.

When a digital certificate is issued, the DN allows users and systems to verify the identity of the CA that issued the certificate. This verification is paramount in establishing trust; without understanding who issued the certificate and verifying that their identity is legitimate, a certificate's authenticity would be compromised.

The other options, while they may relate to different aspects of digital certificates or security, do not accurately describe the purpose or function of a CA's Distinguished Name. For example, the key size, physical address, and encryption algorithm are not contained within the DN itself and serve different roles within the broader context of digital certificates and public key infrastructure (PKI). The DN's primary function remains the identification of the issuing organization.