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Question:

What is the most common format for certificates issued by certificate authorities?

A PEM.
explanation

Privacy Enhanced Mail (PEM) is the most common format issued by certificate authorities. Distinguished Encoding Rules (DER) format is a binary form of the ASCII text PEM format. PKCS#7 or P7B format is Base64 ASCII, and PKCS#12, or PFX, format is the binary format used to store server certificates, intermediate certificates, and private keys in a single file.

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