B:
ABR in areas 0 and 100
D:
"Secondary interfaces are supported for LAN interfaces (the primary interface can be a LAN interface, but any secondary interfaces are treated as point-to-point unnumbered links over the LAN). In this scenario, you must ensure that there are only two routing devices on the LAN or that there are only two routing devices on the LAN that have secondary interfaces configured for a specific OSPF area."
[https://www.juniper.net/documentation/us/en/software/junos/ospf/topics/topic-map/configuring-ospf-areas.html#id-example-configuring-multiarea-adjacency-for-ospf]
root@R5> show ospf neighbor
Address Interface State ID Pri Dead
10.3.3.1 ge-0/0/3.0 Full 10.10.10.3 128 36
Area 0.0.0.0
10.5.5.1 ge-0/0/1.0 Full 10.10.10.20 128 39
Area 0.0.0.2
10.3.3.1 ge-0/0/3.0 Full 10.10.10.3 128 35
Area 0.0.0.100
root@R5> show ospf interface
Interface State Area DR ID BDR ID Nbrs
ge-0/0/3.0 DR 0.0.0.0 10.10.10.5 10.10.10.3 1
lo0.0 DR 0.0.0.0 10.10.10.5 0.0.0.0 0
ge-0/0/1.0 BDR 0.0.0.2 10.10.10.20 10.10.10.5 1
ge-0/0/3.0 PtToPt 0.0.0.100 0.0.0.0 0.0.0.0 1
root@R5>
ABR - area 0 and 100
set area 0.0.0.100 interface ge-1/1/0.0 secondary
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