The Address Resolution Protocol (ARP) is a communication protocol used for discovering the link-layer address, such as a MAC address, associated with a given internet-layer address, typically an IPv4 address. When a host needs to send a packet to another host on the same local network, it knows the destination IP address but not the hardware (MAC) address. ARP sends a broadcast request packet to all devices on the local network asking which device is using that specific IP address. The device with the corresponding IP address replies with its MAC address, allowing the original host to encapsulate the IP packet in a Layer 2 frame and send it directly.

A. Routing tables: These are used by routers to determine the path and next-hop IP address for a packet, not to resolve a specific IP to a hardware address.
C. Reverse address resolution protocol (RARP): This protocol performs the opposite function of ARP; it maps a known hardware address to an IP address.
D. Internet Control Message Protocol (ICMP): This protocol is used for network diagnostics and to report errors in IP packet processing (e.g., ping, destination unreachable).

1. Plummer, D. C. (November 1982). RFC 826: An Ethernet Address Resolution Protocol. Internet Engineering Task Force (IETF). "Abstract: A protocol for mapping dynamically between a 32-bit Internet Address and a 48-bit Ethernet address is presented." Retrieved from https://datatracker.ietf.org/doc/html/rfc826

2. Kurose, J. F., & Ross, K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson. In Chapter 5, Section 5.4.1, "The Link Layer: Links, Access Networks, and LANs," the text states, "the Address Resolution Protocol (ARP)... The role of ARP is to translate IP addresses to link-layer addresses."

3. MIT OpenCourseWare. (Spring 2018). 6.033 Computer System Engineering, Lecture 15: The Network Layer. Massachusetts Institute of Technology. The lecture notes describe ARP's function: "How does a host A find out the Ethernet address for a host B on the same physical network, given B's IP address? Address Resolution Protocol (ARP)." (p. 5).