A MODEM is required to access the internet through only which of the following? What does the word MODEM mean?

A MODEM is required when accessing the internet through a telephone line because:
Computer data is digital
Telephone lines carry analog signals
A modem converts digital ↔ analog signals so data can travel over phone lines.
(For broadband like fiber or Ethernet, a traditional dial-up modem is not required.)
Explanation (Part 2):
MODEM = MOdulator + DEModulator
Modulator → Converts digital → analog
Demodulator → Converts analog → digital
So, MODEM is a device that performs both conversions to enable communication over telephone lines.
Exam-ready line:
A modem is required for internet access through a telephone line and MODEM stands for Modulator–Demodulator.