HOTSPOT
Your network contains two DHCP servers named Server1 and Server2. Server1 fails.
You discover that DHCP clients can no longer receive IP address leases.
You need to ensure that the DHCP clients receive IP addresses immediately.
What should you configure from the View/Edit Failover Relationship settings? To answer,
select the appropriate setting in the answer area.
Answer: 
Explanation:
http://blogs.technet.com/b/teamdhcp/archive/2012/09/03/dhcp-failover-hot-standbymode.aspx
I agree