Final answer:
The correct protocol that assigns unique IP addresses to connected devices for sending data across the Internet is TCP/IP. While DHCP also assigns IP addresses, it is limited to local networks, and TCP/IP is the overarching suite that enables internet communications.
Step-by-step explanation:
The protocol for sending data across the Internet that assigns unique numbers, known as IP addresses, to each connected device is TCP/IP. This stands for Transmission Control Protocol/Internet Protocol, which is a suite of communication protocols used to interconnect network devices on the internet. IP addresses are essential for ensuring that data sent over the internet reaches the correct destination.
Option (c) TCP/IP is the correct answer to this question. DNS, or Domain Name System, translates domain names to IP addresses so browsers can load internet resources, but it does not assign IP addresses. HTTP, or Hypertext Transfer Protocol, is used for transferring web pages. DHCP, or Dynamic Host Configuration Protocol, is indeed responsible for assigning IP addresses within a local network, but it is not used to send data across the Internet as a whole.