What conditions are required for two FortiGate devices to form an OSPF adjacency? (Choose three.)

What conditions are required for two FortiGate devices to form an OSPF adjacency? (Choose three.)
A . IP addresses are in the same subnet.
B . Hello and dead intervals match.
C . OSPF IP MTUs match.
D . OSPF peer IDs match.
E . OSPF costs match.

Answer: A,B,C

Explanation:

https://help.fortinet.com/fos50hlp/54/Content/FortiOS/fortigate-advanced-routing-54/Routing_OSPF/OSPF_Background_Concepts.htm#Adjacenc