Which of the following Linux commands will resolve a domain name into IP address?

The `host` command is a standard Linux utility for performing DNS lookups. The `-t a` option specifically instructs `host` to query for the 'A' record (Address record), which maps a domain name to an IPv4 address, effectively resolving the domain name to its IP.

The `host -t ns` command queries for the Name Server (NS) records, which list the authoritative DNS servers for a domain, not its IP address.

The `host -t soa` command queries for the Start of Authority (SOA) record, which provides administrative information about the zone, not the domain's IP address.

The `host -t AXFR` command attempts a full zone transfer, which is used to replicate DNS zone data between servers and is generally restricted for security reasons, not to simply resolve a domain's IP.