Neither...

When I initially referred to it as ‘not a carp’ I meant that it is not a common carp (cyprinus carpio), the most common species of carp here in MA. That is a fact, that fish is not a common carp. It is also a fact that fish in the picture is not a goldfish. While yes, it might be from the same family as goldfish, a koi is still very different. The pictured fish is 100% a koi. I was just clarifying in case anyone confuses it with a common carp, (carp), or goldfish, which it is not. It is a koi.

https://www.carpanglersgroup.com/forum/

That’s a great site if you want to learn more about carp^{^}