Which protocol was created as an alternative to RARP?

A.
Address resolution protocol (ARP).

B.
Interior gateway routing protocol (IGRP).

C.
Classless interdomain routing (CIDR).

D.
BOOTstrap protocol (BOOTP).

Explanation:
BOOTP is used by diskless workstations to obtain an IP address. The BOOTP enabled
workstation broadcasts a packet with its MAC address in it, requesting an IP address. Essentially,
RARP also does this, RARP requests an IP address based on a given MAC address.
The question is oddly worded. Since ARP and RARP were based on the BOOTP protocol. This
implies that BOOTP was here first, and RARP was the alternative.
Incorrect Answers:
A: ARP is the complement of RARP, where an IP address is given and we are looking for a
hardware address.
B: IGRP is a routing protocol, and is only used by routers to update their routing tables.
C: CIDR is a method of combining adjacent networks into one larger network. It is not involved in
MAC to IP address resolution.