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.