Which two of the following commands will place network 10.2.3.0/24 into area 0? router eigrp 10 router ospf 10 network 10.0.0.0 network 10.2.3.0 0.0.0.255 area0 network 10.2.3.0 0.0.0.255 area 0

To enable OSPF, you must first start OSPF using a Process ID. The number is irrelevant; just choose a number from 1 to 65,535 and you're good to go. After you start the OSPF process, you must configure any network that you want advertised via OSPF using wildcards and the area command. Statement (4) is wrong because there must be a space after the parameter area and before you list the area number.