Dhcp server config

Hi all…
In DHCP Server configuration page
We see two option:
1- Delay threshold
2- Authoritative: after 10s delay
I founded delay threshold used for dhcp failover
When primary dhcp cant access, backup after “Delay threshold” answer the dhcp client request.

Anyone can help me about Authoritative : after 10s delay or yes or no or 2s delay ???