What should you keep in mind when using a midspan PSE?

A.
It can be used to deliver PoE over 100BASE-T connections

B.
It can implement power delivery only over the spare wires of the copper cabling

C.
It defines terminology to describe a port that acts as a PSE to a powered device

D.
It states that power can be delivered by an end-point PSE

Explanation:
content\166040\plo_content\ORG1114\COURSE166040\enus_011425\lsn_08\tpc_e\enus_011425_08e.xml
If a midspan PSE is used, then the midspan PSE can only implement power delivery over the spare wires of the copper cabling and it cannot be used to deliver PoE over 1000BASE-T connections. It should be noted that even if a device supports both methods of providing power, only one mechanism may be used to deliver power to a powered device.