We pick k.root-servers.net, one of the 13 root servers (1), and ask it about alpha.smfood.com and learn that com is delegated to 13 name servers (2), so we ask d.gtld-servers.net where we learn that smfood.com is delegated to two name servers, including ns1.smfood.com (3), so we ask that one and get the following answer:
All of the four domains that use the primary name server ns1.smfood.com use name server group 1. Worth noting is that four of the domains that use name server group 1 use the primary name server ns1.smfood.com.
The two name servers ns1 and ns2.smfood.com together
There are five domains that use name server group 1.
All of those are under the tld "com".
All of them use only the IPv4 number 188.8.131.52. Worth noting is that five of the domains that only use the IPv4 number 184.108.40.206 use name server group 1.