Your network contains two DHCP servers named Server1 and Server2. Server1 and Server2 are located in the same subnet. You configure a split scope named Scope1 on the DHCP servers.

You need to ensure that Server2 only responds to DHCP client requests if Server1 is unavailable.

What should you modify?

A.
the Scope1 properties for Server1

B.
the Scope1 properties for Server2

C.
the server options for Server1

D.
the server options for Server2