Which of the following commands will securely copy the directory ./fyf/to/var/tmp/ on the remote host deltaur using the remote user account kevin?

Which of the following commands will securely copy the directory ./fyf/to/var/tmp/ on the remote host deltaur using the remote user account kevin?

A.
rsync -a -e ssh kevin@deltaur:/var/tmp/ fyf/

B.
rsync -a -u kevin -e ssh fyf/ deltaur:/var/tmp/

C.
rsync -a -u kevin -e ssh deltaur:/var/tmp/ fyf/

D.
rsync -a -e ssh fyf/ kevin@deltaur:/var/tmp/