The new site links are named MEL-SYD-BETA and MEL-ADL-BET

You are configuring secondary links for the connections between the Melbourne and Sydney sites
and between the Melbourne and Adelaide sites. The existing Melbourne to Sydney site link is
called MEL-SYD-ALPHA and has a site link cost of 100. The existing Melbourne to Adelaide site
link is called MEL-ADL-ALPHA and has a site link cost of 100.
You want the secondary site links to be used only when the existing site links are unavailable.
The new site links are named MEL-SYD-BETA and MEL-ADL-BETA.
Which of the following steps should you take to accomplish this goal?

A.
Configure the site link cost for the MEL-SYD-BETA with a value of 110.

B.
Configure the site link cost for the MEL-ADL-BETA with a value of 110.

C.
Configure the site link cost for the MEL-ADL-BETA with a value of 90.

D.
Configure the site link cost for the MEL-SYD-BETA with a value of 90.