The output explicitly states This router is an ABR. An OSPF area border router has interfaces participating in multiple OSPF areas and provides connectivity between those areas and the backbone. Therefore, A is correct.
The output also states that the RFC1583Compatibility flag is enabled. The Enterprise Firewall 7.6 Administrator Study Guide explains that FortiGate can use RFC 1583-compatible OSPF path selection for ECMP, where eligible external routes of equal cost can be installed concurrently. This makes D correct.
Nothing in the displayed status identifies the FortiGate as a backup designated router, so B cannot be concluded. Option C describes an autonomous system boundary router (ASBR), which originates external LSAs when redistributing routes into OSPF. Being an ABR does not by itself mean the router is injecting external routing information.
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