How can you protect the configuration file from eavesdropping, when uploading from a Cisco WLC?

How can you protect the configuration file from eavesdropping, when uploading from a Cisco
WLC?

A.
Use the Configuration File Encryption option.

B.
Choose an SCP as the transfer method.

C.
Connect to the Cisco WLC by using HTTPS.

D.
Connect to the Cisco WLC by using SSH.