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A digital certificate typically follows the X.509 standard. X.509 is a widely adopted format for defining the structure of public key certificates. These certificates are used in various security protocols, including SSL/TLS for secure web communications and in virtual private networks (VPNs).

X.509 specifies the format for the certificates themselves, which includes information such as the public key, the identity of the certificate holder (such as a user or an organization), and details about the issuer of the certificate. This standard ensures that certificates can be recognized and processed by different systems, enabling trust across multiple platforms and applications.

The other options relate to security and cryptography but do not pertain specifically to the structure and format of digital certificates. ISO/IEC 27001 deals with information security management systems, RSA refers to a specific asymmetric cryptographic algorithm, and PKCS#7 is a standard for cryptographic message syntax. None of these options define the overall framework for digital certificates like X.509 does.