A modem is classified as low speed if data rate handled is

Upto 100 bps

Upto 250 bps

Upto 400 bps

Upto 600 bps

Explanation

MODEM stands for Modulation and Demodulation.

A modem's purpose is to convert digital information to analog signals (modulation), and to convert analog signals back into useful digital information (demodulation).