You have configured your Active Directory environment with multiple sites and have placed the appropriate resources in each of the sites. You are now trying to choose a protocol for the transfer of replication information between two sites. The connection between the two sites has the following characteristics: The link is generally unavailable during certain parts of the day because of an unreliable network provider. The replication transmission must be attempted whether the link is available or not. If the link was unavailable during a scheduled replication, the information should automatically be received after the link becomes available again. Replication traffic must be able to travel over a standard Internet connection. Which of the following protocols meets these requirements? a. IP
b. SMTP
c. RPC
d. DHCP