For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)

For what two purposes does the Ethernet protocol use physical addresses? (Choose two.)
A . to uniquely identify devices at Layer 2
B . to allow communication with devices on a different network
C . to differentiate a Layer 2 frame from a Layer 3 packet
D . to establish a priority system to determine which device gets to transmit first
E . to allow communication between different devices on the same network
F . to allow detection of a remote device when its physical address is unknown

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Answer: AE