which command should be added, or edited, on router B1 under router ospf 10?

Refer to the exhibit.

The network administrator is trying to configure mutual redistribution between
EIGRP and OSPF. Autosummarization in EIGRP 100 AS is disabled. After adding OSPF
configuration to router B1, the network administrator checked the routing table of router B2, but
none of the EIGRP routes appeared there.
To redistribute the EIGRP AS 100 routes into OSPF, which command should be added, or edited,
on router B1 under router ospf 10?

A.
redistribute eigrp 100 metric-type 1

B.
redistribute eigrp 100 subnets

C.
no auto-summary 10.0.0.0 255.0.0.0

D.
area 0 range 10.10.0.0 255.255.0.0

Explanation:
When redistributing into OSPF without keyword “subnets”, only classful networks will be
redistributed. Classful networks here mean networks with the default major subnet masks (for
example 10.0.0.0/8; 180.1.0.0/16; 200.200.200.0/24…).
In fact, the routing table on the exhibit above is not totally correct. The network 192.168.110.0/24
will be redistributed and shown in the routing table of B2 even if the keyword “subnets” is not used

because it belongs to class C with the default subnet mask of class C.
To make all the networks, including subnets appear in the routing table of B2 we must use
keyword “subnets” when redistributing into OSPF. This is also an important thing to remember
when redistributing into OSPF.