William has an internet connection that does not allow him to make calls when connected to the internet. what internet service can he use over his existing telephone line that will enable him to make calls and browse the internet at the same time?

a. dial-up
b. isdn
c. cable internet access
d. satellite internet access

Dial-up, 95% sure.

Explanation:

It was kinda hard at first because ISDN & DIAL-UP are some what the same. After looking in to it though... it seems like ISDN are not really known for there Internet and telephone services. However DIAL-UP  is pretty good with both, and there fast! So, I personally choose DIAL-UP.

I hope this helps! Stay awesome.

yes the ansewer is c bc you can look it up!

(because i need 20 chars)