After entering "arp" into the MS-DOS command line, which of the following switches would display the ARP cache?

Entering "arp" into the MS-DOS command line followed by the appropriate switch will display information pertaining to the Address Resolution Protocol (ARP). The correct answer, which includes the switches "-a" or "-g," is the one that successfully displays the ARP cache.

The ARP cache is a table that stores mappings between IP addresses and MAC addresses on a network, which allows for faster communication as the system does not need to resolve addresses repeatedly. Using the "-a" or "-g" switch with the "arp" command instructs the system to show all entries in the ARP cache, providing you with the necessary information to see which devices are communicating on the network and their corresponding addresses.

Other options like "-r", "-s", and "-d" do not serve the purpose of displaying the ARP cache. The "-r" option would typically show routing information rather than ARP entries, whereas "-s" is used to manually add entries to the ARP cache, and "-d" is utilized to delete specific entries from it. Thus, the selected switches effectively allow for viewing the ARP cache, making them the appropriate choice for this command.