单选题For a router to obtain a certificate from a CA， what is the first stepof the certificate enrollment process？（）A the router generates a certificate request and forwards it tothe CAB the router generates an RSA key pairC the router sends its public key to the CAD the CA sends its public key to the routerE the CA verifies the identity of the routerF the CA generates a certificate request and forwards it to the router
单选题
For a router to obtain a certificate from a CA， what is the first stepof the certificate enrollment process？（）
A
the router generates a certificate request and forwards it tothe CA
B
the router generates an RSA key pair
C
the router sends its public key to the CA
D
the CA sends its public key to the router
E
the CA verifies the identity of the router
F
the CA generates a certificate request and forwards it to the router
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