Apex domains cannot have CNAME records.
Question and response
Question
dig gunnelectricinc.com. NS
Answer
gunnelectricinc.com. 5 NS ns-1807.awsdns-33.co.uk.
gunnelectricinc.com. 5 NS ns-1853.awsdns-39.co.uk.
gunnelectricinc.com. 5 NS ns-88.awsdns-11.com.
gunnelectricinc.com. 5 NS ns-563.awsdns-06.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0