Apex domains cannot have CNAME records.
Question and response
Question
dig service-solutions.ua. NS
Answer
service-solutions.ua. 1 NS nsb4.srv53.org.
service-solutions.ua. 1 NS nsd2.srv53.net.
service-solutions.ua. 1 NS nsa3.srv53.com.
service-solutions.ua. 1 NS nsd4.srv53.org.
service-solutions.ua. 1 NS nsa3.srv53.org.
service-solutions.ua. 1 NS nsc1.srv53.net.
service-solutions.ua. 1 NS nsb2.srv53.net.
service-solutions.ua. 1 NS nsd4.srv53.com.
service-solutions.ua. 1 NS nsb4.srv53.com.
service-solutions.ua. 1 NS nsa4.srv53.net.
service-solutions.ua. 1 NS nsc4.srv53.com.
service-solutions.ua. 1 NS nsc2.srv53.org.
Authority
The response has no authority records.
Additional
nsa3.srv53.com. 2 A 178.32.247.9
nsa3.srv53.org. 2 A 178.32.247.5
nsa4.srv53.net. 2 A 178.32.247.2
nsb2.srv53.net. 2 A 135.181.9.151
nsb4.srv53.com. 2 A 135.181.9.156
nsb4.srv53.org. 2 A 135.181.9.158
nsc1.srv53.net. 2 A 78.27.225.72
nsc2.srv53.org. 2 A 78.27.225.68
nsc4.srv53.com. 2 A 78.27.225.62
nsd2.srv53.net. 2 A 89.184.64.69
nsd4.srv53.com. 2 A 89.184.64.79
nsd4.srv53.org. 2 A 89.184.64.97
nsa3.srv53.com. 2 AAAA 2001:41d0:203:dee4:178:32:247:9
nsa3.srv53.org. 2 AAAA 2001:41d0:203:dee4:178:32:247:5
nsa4.srv53.net. 2 AAAA 2001:41d0:203:dee4:178:32:247:2
nsb2.srv53.net. 2 AAAA 2a01:4f9:4a:530c:181:9:151:2
nsb4.srv53.com. 2 AAAA 2a01:4f9:4a:530c:181:9:156:2
nsb4.srv53.org. 2 AAAA 2a01:4f9:4a:530c:181:9:158:2
nsc1.srv53.net. 2 AAAA 2a02:2279:0:1201:78:27:225:72
nsc2.srv53.org. 2 AAAA 2a02:2279:0:1201:78:27:225:68
nsc4.srv53.com. 2 AAAA 2a02:2279:0:1201:78:27:225:62
nsd2.srv53.net. 2 AAAA 2a02:2278:70eb:298:89:184:64:69
nsd4.srv53.com. 2 AAAA 2a02:2278:70eb:298:89:184:64:79
nsd4.srv53.org. 2 AAAA 2a02:2278:70eb:298:89:184:64:97
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0