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

The 'host -t a' command specifically requests the DNS A (address) record type for a domain, which returns the associated IPv4 address. This is the standard command-line method to perform forward DNS resolution from a hostname to an IP address.

The '-t ns' flag queries for NS (Name Server) records, which return the authoritative DNS servers for the domain rather than an IP address.

The '-t soa' flag queries for the Start of Authority record, which contains administrative zone information such as serial number and refresh intervals, not the domain's IP address.

The '-t AXFR' flag requests a full DNS zone transfer to retrieve all records in a zone - this is a reconnaissance technique, not a simple hostname-to-IP resolution.