单选题
For a router to obtain a certificate from a CA， what is the first stepof the certificate enrollment process？（）
发布日期：2020-04-11
the router generates a certificate request and forwards it tothe CA
the router generates an RSA key pair
the router sends its public key to the CA
the CA sends its public key to the router
the CA verifies the identity of the router
the CA generates a certificate request and forwards it to the router
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