Your network contains an Active Directory forest. The forest contains two domain controllers. The  domain controllers are configured as shown in the following table. 

All client computers run Windows 7.    
You need to ensure that all client computers in the domain keep the same time as an external  time server.    
What should you do（）

Your network contains three Active Directory forest named Forest1， Forest2， and Forest3. Each  forest contains three domains.  
A two-way forest trust exists between Forest1 and Forest2. A two-way forest trust exists between  Forest2 and Forest3.     
You need to configure the forest to meet the following requirements    
Users in Forest3 must be able to access resources in Forest1.  
Users in Forest1 must be able to access resources in Forest3.  The number of trusts must be minimized.    
What should you do（）