How can the Relay Diagnostics page be secured?

How can the Relay Diagnostics page be secured?
A . Set the client setting _BESRelay_Diagnostics_Disable to a value of 1.
B . Configure the relay proxy to only allow internal connections.
C . Create an .htaccess file to redirect the diagnostics url.
D . Assign a value to the _BESRelay_Diagnostics_Password client setting.

Answer: D