Which statements describe the routing protocol OSPF？（）

• A、 It supports VLSM.
• B、 It is used to route between autonomous systems.
• C、 It confines network instability to one area of the network.
• D、 It increases routing overhead on the network.
• E、 It allows extensive control of routing updates.
• F、 It is simpler to configure than RIP v2.