Which two characteristics of plenum cable are true?

Which two characteristics of plenum cable are true? (Choose two.)
A. It is more fire-resistant than nonplenum cable.
B. It can be installed above a drop-down ceiling without additional safety precautions.
C. It is less fire-resistant than nonplenum cable.
D. When it burns, it may release more toxins than nonplenum cable.
E. It requires additional safety precautions when installed above a drop-down ceiling.

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