Which command would be used to store a PKI resource on an external server?

Which command would be used to store a PKI resource on an external server?

A.
ace/context# copy {local_filename} ftp {ip_address} {username} {remote_filename}

B.
ace/context# copy {local_filename} sftp {ip_address} {username} {remote_filename}

C.
ace/context# crypto copy {local_filename} ftp {ip_address} {username} {remote_filename}

D.
ace/context# crypto export {local_filename} ftp {ip_address} {username} {remote_filename}