What is true about certificates in PFX format?

Certificates in PFX format are designed to serve a particular purpose in digital security and cryptography. The PFX format, also known as PKCS#12, is a binary format that enables the bundling of a private key along with the associated public certificate in a single file. This is especially useful because it simplifies the management and transfer of both the certificate and its private key, which are typically needed together for secure communications.

Using PFX files allows for a structured and secure way to store and transport cryptographic material since the private key is sensitive and must be protected. By encapsulating both the public certificate and the private key into one file, it becomes easier to install and deploy them in various applications that require authenticating entities and enabling secure connections.

Other options imply configurations that do not align with the PFX format's purpose. For instance, the idea of separate files for the certificate and the private key contradicts the PFX's utility, as one of its main features is to consolidate them. Unlike options that mention containing only one component or solely being used for public certificates, the PFX format is specifically constructed to accommodate both components, thus providing comprehensive support for secure communication protocols.