A Linux engineer needs to get information from the foo.

To query Mail Exchange (MX) records for a domain, use dig:dig mx foo.com

To query Mail Exchange (MX) records for a domain, use dig:dig mx foo.com

To query Mail Exchange (MX) records for a domain, use dig:dig mx foo.com

MX records specify which mail servers handle email for a domain.

Why the other options are incorrect?

A. arp mx foo.com → Incorrect, arp is used for MAC address resolution, not DNS lookups.

B. nc mx foo.com → Incorrect, nc (netcat) is used for networking and port scanning, not DNS queries.

D. route mx foo.com → Incorrect, route manages routing tables, not DNS records.