Which of the following openssl commands generates a certificate signing request (CSR) using the already existing private key contained in the file private/keypair.pem?

Which of the following openssl commands generates a certificate signing request (CSR) using the already existing private key contained in the file private/keypair.pem?
A . openssl req -key private/keypair.pem -out req/csr.pem
B . openssl req – new -key private/keypair.pem -out req/csr.pem
C . openssl gencsr -key private/keypair.pem -out req/csr.pem
D . openssl gencsr -new- key private/keypair.pem -out req/csr.pem

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Answer: B