Which type of protocol is OSPF and what metric does it use to determine best path?

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Which type of protocol is OSPF and what metric does it use to determine best path?
A . Link-state protocol that uses a concept of cost as metric
B . Hybrid protocol that uses hop count as a metric
C . Path vector protocol that uses the Dijkstra algorithm as a metric
D . Distance Vector protocol that uses bandwidth and delay as metric

Answer: A