What statement about 802.3. Clause 33 Power over Ethernet is true?

What statement about 802.3. Clause 33 Power over Ethernet is true?
A . Only midspan PSEs are supported.
B . The lowest voltage drop is achieved when using CAT6 cable instead of CAT5 or CAT5e.
C . Only endpoint PSEs are supported.
D . When using CAT5 cabling, you increase the maximum draw available to the PD over that available with CAT6.

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Answer: B