What happens when a 320W power supply is installed on an EX 4200 switch with full Power over Ethernet (PoE) support?

A.
Power is available only to devices that are onPoE class 2 or above.

B.
Power is available only to devices that are onPoE class 3 or above.

C.
Only the first eight ports are provided with power.

D.
No power is available until the correct power supply is installed.