Refer to the exhibit.Two routers have just been configured by a new technician. All interfaces are up. However， the routers are not sharing their routing tables. What is the problem？（）

• A、Split horizon is preventing Router2 from receiving routing information from Router1.
• B、Router1 is configured for RIP version 2,and Router2 is configured for RIP version 1.
• C、Router1 has an ACL that is blocking RIP version 2.
• D、There is a physical connectivity problem between Router1 and Router2.
• E、Router1 is using authentication and Router2 is not.