Refer to the exhibit. A company would prefer all Internet - bound OSPF routed traffic to use ISP ABC with ISP DEF as a backup. As the network consultant, what three configuration changes might you make?（）

• A、The default -information originate command should be configured on router B1 and B4.
• B、The default -information originate command should be configured on router B2 and B3.
• C、If the metric value for ISP ABC is set at the default, the I SP DEF metric value should be set to 1.
• D、If the metric value for ISP ABC is set at the default, the ISP DEF metric value should be set to 25.
• E、The metric type value should be set to type 1.
• F、The metric type value should be set to type 2.