What should you recommend?

Your company has one office in Montreal and one office in New York. Each office has 2,000 client computers configured as DHCP clients. DHCP relay is not supported on the network routers.
The network consists of one Active Directory domain.
You need to recommend a DHCP addressing solution for both offices. The solution must meet the following requirements:
Minimize traffic between offices.
Be available if a single server fails.
What should you recommend?
A. In each office, install a DHCP server that has two scopes.
B. In each office, install a DHCP instance on a two node failover cluster.
C. In the Montreal office, install a DHCP server. In the New York office, install a DHCP Relay Agent.
D. In the Montreal office, install a DHCP instance on a two node failover cluster. In the New York office, install a DHCP Relay Agent.