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.