Apex domains cannot have CNAME records.
Question and response
Question
dig digitallandmarkinc.com. NS
Answer
digitallandmarkinc.com. 4 NS ns-888.awsdns-47.net.
digitallandmarkinc.com. 4 NS ns-1772.awsdns-29.co.uk.
digitallandmarkinc.com. 4 NS ns-1496.awsdns-59.org.
digitallandmarkinc.com. 4 NS ns-956.awsdns-55.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0