To answer this question, you need to understand the technology used to make telephone calls over the Internet.
Option A) Intertel - This option is incorrect because Intertel is not the technology used to make telephone calls over the Internet.
Option B) Telenet - This option is incorrect because Telenet is not the technology used to make telephone calls over the Internet.
Option C) VoIP - This option is correct. VoIP stands for Voice over Internet Protocol, which is the technology used to make telephone calls over the Internet. It converts voice signals into digital packets and transmits them over an IP network.
Option D) VoRP - This option is incorrect because VoRP is not the technology used to make telephone calls over the Internet.
The correct answer is C) VoIP. This option is correct because it accurately identifies the technology used for making telephone calls over the Internet.