Correct Answer:
Option C - Dial-up internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to established a connection to an Internet Service Provider by dialling a telephone number on a conventional telephone line. It is considered the slowest internet service among all.
C. Dial-up internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to established a connection to an Internet Service Provider by dialling a telephone number on a conventional telephone line. It is considered the slowest internet service among all.