Stop thinking only about SDWAN commands and think of the Routing portion. By doing summarization we instantly make the router less preferred, as the other one will have more specific routes. Correct answer should be C.
A looks like the option:
The OSPFv3 max-metric router LSA feature enables OSPFv3 to advertise its locally generated router LSAs with a maximum metric. The feature allows OSPFv3 processes to converge but not attract transit traffic through the device if there are better alternate paths.
vpn vpn-id --> router --> ospf --> max metric not accepted, only accepts if you write router-lsa after max-metric
vpn vpn-id --> router --> ospf --> area number --> nssa --> no-summary is ACCEPTED in vEdge
its not, doing "max-metric" will cause router to advertise it with infinite metric, even if primary path will be lost backup won't be installed since metric is infinite hence invalid to install. C is correct because you summarize prefix to make it less specific so it's not preferred when main route is installed but when the main is lost this summary will come into play
A would be correct if there is "router-lsa"
vEdge-INET-1# conf t
Entering configuration mode terminal
vEdge-INET-1(config)# vpn 1
vEdge-INET-1(config-vpn-1)# router
vEdge-INET-1(config-router)# ospf
vEdge-INET-1(config-ospf)# max-metric
--------------------------------------^
syntax error: incomplete path
vEdge-INET-1(config-ospf)# max-metric ?
Possible completions:
router-lsa Advertise own router LSA with infinite distance
vEdge-INET-1(config-ospf)# max-metric
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