HOTSPOT
Your network contains one Active Directory forest named contoso.com. The forest contains the domain
controllers configured as shown in the following table.
You perform the following actions:
Create a file named File1.txt in the SYSVOL folder on DC1.
Create a user named User1 on DC4.You need to identify on which domain controller or controllers a copy of each object is stored.
What should you identify? To answer, select the appropriate options in the answer area.
Hot Area:
Answer: 
can someone give explanation why?
User 1 will be replicated to DC4 DC5 DC6
Given answer is INCORRECT.
The file is created on DC1. DC1 is member of the contoso.com domain as well as DC2 and DC3. So The file is stored on DC3 (as well as DC1 and DC2).
The user is created on DC4. DC4 is member of the NA.contoso.com domain as well as DC5 and DC6. So the user is stored on DC4, DC5, DC6 AND DC1 and DC2(as these are a Global Catalog). But as DC1 and DC2 are not a given choise, we need to select DC4, DC5 and DC6.