Final answer:
The primary protocol used to enable Internet access from a mobile device or smartphone is WAP (Wireless Application Protocol). It ensures efficient data transmission over wireless networks, although modern devices now also use more advanced standards and typical web protocols. Option C is correct.
Step-by-step explanation:
The protocol that is mainly used to enable access to the Internet from a mobile device or smartphone is C. WAP (Wireless Application Protocol). WAP is a technical standard for accessing information over a mobile wireless network. Mobile devices use this protocol to ensure that data is transmitted efficiently over the wireless network. Although it was more prominent in the early days of mobile internet, it's worth noting that, nowadays, mobile devices access Internet services using more advanced standards like 4G/5G and Wi-Fi technologies, as well as standard web protocols such as HTTP and HTTPS.
WAP is a technical standard that allows mobile devices to access websites and services on the Internet. It provides a framework for communication between mobile devices and Internet servers, allowing users to browse web pages, download files, and send/receive emails.