[多选] You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options a re valid checks that should be performed first to verify proper OSPF operation?（）

A . Are the ASBRs trying to redistribute the external routes into a totally stubby area?
B . Are the ABRs configured with stubby areas?
C . Is the subnets keyword being used with the redistribution command?
D . Is backbone area (area 0) contiguous?
E . Is the CPU utilization of the routers high?

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[多选] You are troubleshooting an OSPF problem where external routes are not showing up in the OSPF database. Which two options a re valid checks that should be performed first to verify proper OSPF operation?（）

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