What precautions are there when OSPF is used?

Current enterprise networks usually use OSPF as the routing protocol.

What precautions are there when OSPF is used? (Multiple Choice)
A . Determine that the backbone area will not split,
B . Check whether secondary optimal routes exist on the network according to OSPF route selection
C . Check whether all non-backbone areas are correctly and reliably connected to the backbone area,
D . Check the OSPF network topology and ensure that no loop exists when OSPF routes are being calculated.
E . Verify that OSPF costs can correctly demonstrate the actual bandwidth of links at more than 100 Mbit/s.

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Answer: ABCE