Which of the following use baseband transmission?

A.
CATV

B.
Ethernet

C.
Cable modem

D.
ADSL

Explanation:
Ethernet is a baseband transmission method that requires a direct
current be applied to the wire, high voltages representing a 1 bit and low voltage
loads representing a 0 bit. This differs from broadband, the method that the other
possible choices use. Broadband method allows multiple channels on the same medium,
which in turn allows for multiple simultaneous data