Apex domains cannot have CNAME records.
Question and response
Question
dig wbuc.org. NS
Answer
wbuc.org. 4 NS ns-510.awsdns-63.com.
wbuc.org. 4 NS ns-1275.awsdns-31.org.
wbuc.org. 4 NS ns-663.awsdns-18.net.
wbuc.org. 4 NS ns-1624.awsdns-11.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0