Which two statements are true about PCI bus mastering? (Select TWO)

Which two statements are true about PCI bus mastering? (Select TWO)

A.
It enables multiple devices to take over the bus without locking each other out.

B.
It enables automatic identification and allocation of resources to system devices.

C.
It enables external devices to be connected to an internal PCI bus.

D.
It enables the controller connected to the bus to communicate directly with other devices without going through the CPU.