Final answer:
The most credible domain is .gov, which is affiliated with the federal government.
Step-by-step explanation:
The most credible domain is .gov, which is affiliated with the federal government. Websites with .gov domains are generally more trustworthy sources of information than .com websites, which are commercial or business websites. The .gov domain indicates that the website is affiliated with a government agency or organization, making it a reliable source for factual and authoritative information.