You are designing a strategy for implementing Internet Authentication Service (IAS) to meet the business  and technical requirements. What should you do?（）

• A、Install IAS on VPN1, VPN2, and VPN3.
• B、Install IAS on VPN1, Configure VPN2 and VPN3 as RADIUS clients.
• C、Install IAS on VPN1, Configure VPN1, VPN2, and VPN3 as RADIUS clients.
• D、Install IAS on DC1, Configure VPN2 and VPN3 as RADIUS clients. Create all remote access policies on VPN1.
• E、Install IAS on DC2, Configure VPN2 and VPN3 as RADIUS clients. Configure remote access logging on VPN1.