Apex domains cannot have CNAME records.
Question and response
Question
dig elavon.com. NS
Answer
elavon.com. 5 NS ns4.elavon.com.
elavon.com. 5 NS ns1.elavon.com.
elavon.com. 5 NS ns2.elavon.com.
elavon.com. 5 NS ns3.elavon.com.
Authority
The response has no authority records.
Additional
ns1.elavon.com. 5 A 195.245.90.60
ns2.elavon.com. 5 A 204.194.192.20
ns3.elavon.com. 5 A 193.155.119.60
ns4.elavon.com. 5 A 204.194.196.20
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0