You have add more for anyone to be able to answer this, sorry
Answer:
1. a modem connects a computer to the internet
4. a modem transmits digital signals over a telephone line
5. a dial-up modem communicates using a telephonic call
All of three mentioned above.
Modem stands for modulator de-modulator, and it connects the computer to the internet. Its not the fastest, which is router. And the connection is established via the telephone line, through which the digital signals is being transmitted, And the type used is dial up communication.
Explanation:
The answer is self explanatory.
