Apex domains cannot have CNAME records.
Question and response
Question
dig zoneopportunityknocks.com. NS
Answer
zoneopportunityknocks.com. 5 NS ns2.zoneopportunityknocks.com.
zoneopportunityknocks.com. 5 NS ns1.zoneopportunityknocks.com.
Authority
The response has no authority records.
Additional
ns1.zoneopportunityknocks.com. 5 A 69.197.183.74
ns2.zoneopportunityknocks.com. 5 A 69.197.183.77
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0