Select the three best answers which best describe Private Network-to Network Interface （PNNI） in an ATM network.（）

• A、It is the Routing protocol used between ATM switches
• B、PNNI uses the same Dijsktra algorithm for SPF calculation
• C、PNNI and OSPF use the same Database to make cohesive decision for packet forwarding
• D、PNNI measures line capacities and delays in addition to simple cost metrics