A. Configure a demand-dial router.
B. Create multiple Active Directory site links.
C. Configure a VPN connection between each branch office.
D. Install an Internet Authentication Service （IAS） server in each branch office.

A. Create a single forest that has one domain. Use OUs to separate the departments.
B. Create a single forest that has multiple domains to represent every department.
C. Create a single forest that has three domains： one for finance， one for HR， and one for the remaining departments.
D. Create multiple forests that have a single domain in each forest to represent the departments.