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Question:

Which of the following tools can Brian utilize to generate a self-signed x.509 certificate?

A OpenSSL.
explanation

A certificate can be created using OpenSSL with a command similar to this one:
openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyoutprivateKey.key -out certificate.crt.
The remaining tools listed cannot be used to generate a certificate.

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