Explanation/Reference:
Explanation:
NOT A
Set-ADServerSettings
Use the Set-AdServerSettings cmdlet to manage the Active Directory Domain Services (AD DS) environment in the current Exchange Management Shell session.
The Set-AdServerSettings cmdlet replaces the AdminSessionADSettings session variable that was used in Microsoft Exchange Server 2007.
The ConfigurationDomainController parameter specifies the fully qualified domain name (FQDN) of the configuration domain controller to be used for reading Exchange configuration information in this session.
NOT B
Issue is related to AD Site replication
NOT D
Will not improve the site replication
You can use the Shell to update a global address list (GAL). A GAL is a directory that contains entries for every group, user, and contact within an organization's implementation of Microsoft Exchange.
C
You must set the site link replication interval property to indicate how frequently you want replication to occur during the times when the schedule allows replication. For example, if the schedule allows replication between 02:00 hours and 04:00 hours, and the replication interval is set for 30 minutes, replication can occur up to four times during the scheduled time. The default replication interval is 180 minutes, or 3 hours.
Consider the following criteria to determine how often replication occurs within the schedule window:
A small interval decreases latency but increases the amount of WAN traffic.
To keep domain directory partitions up to date, low latency is preferred.
http://technet.microsoft.com/en-us/library/cc738212(v=WS.10).aspx