OSPF route classification: divided into 4 categories, what are the priorities in order?
A . intra-area routing, inter-area routing, first-class external routing, and second-class external routing
B . Intra-area routing, inter-area routing, second-class external routing, and first-class external routing
C . Inter-area routing, intra-area routing, first-class external routing, and second-class external routing
D . Inter-area routing, intra-area routing, second-class external routing, and first-class external routing
Answer: A