What monitors the remaining toner level in a print cartridge?

A.
the DC controller via the high-voltage power supply
B.
the inter-connect board via the low-voltage power supply
C.
the formatter via the toner collection unit
D.
the hard disk via the toner collection unit
Explanation:
WRONG
OMG this printer not even has Toner Collect Unit….
DC Controller!!!
Answer A
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