Which two are characteristics of link-state routing protocols?（） (Choose two.)

A、Routers choose a best path for a destination based on the SPF algorithm.

B、All routers in a given area or level build a consistent database describing the network's topology.

C、Routers choose the best path for a destination based on the interface on which they received the link stateadvertisement with the lowest cost.

D、All routers in a given area or level forward link state advertisements between interfaces in the same area or level, adding their metric to the link state advertisement's cost information when they forward it.

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