Your network consists of a single Active Directory forest that contains two domains named contoso.com and litwareinc.com. All domain controllers for contoso.com are in an office located in Singapore. All domain controllers for litwareinc.com are in an office located in Los Angeles. There is a single 128-Kbps WAN link between the two offices.All domain controllers run Windows Server 2003 Service Pack 2 （SP2） and are configured as DNS servers. Each domain controller contains a standard DNS zone for its respective domain.You need to ensure that users in the Singapore office can resolve IP addresses for servers in the Los Angeles office. The solution must minimize replication traffic over the WAN link. What should you do？（）

A. Create a shortcut trust between contoso.com and litwareinc.com.
B. Place a domain controller for litwareinc.com in the Singapore office.
C. On a domain controller in the Singapore office， create a secondary zone for the litwareinc.com domain.
D. On a domain controller in the Singapore office， create a conditional forwarder for the litwareinc.com domain.