In computer networking, which of the following is a function of a modem?

A modem modulates outgoing digital data into analog signals for the line and demodulates incoming analog signals back to digital, giving it its name.

Modulation of signals is the defining function of a modem in networking.

Decryption of data is a security operation performed by software, not a modem function.

Amplification of signals is done by devices such as repeaters and amplifiers.

Error correction of transmitted data is handled by network protocols, not by the modem alone.

The word modem itself is formed from modulator and demodulator.