Apex domains cannot have CNAME records.
Question and response
Question
dig edifecs.com. NS
Answer
edifecs.com. 5 NS dns2.edifecs.com.
edifecs.com. 5 NS dns3.edifecs.com.
edifecs.com. 5 NS dns1.edifecs.com.
Authority
The response has no authority records.
Additional
dns1.edifecs.com. 5 A 66.118.14.7
dns2.edifecs.com. 5 A 66.118.12.7
dns3.edifecs.com. 5 A 66.118.13.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0