Apex domains cannot have CNAME records.
Question and response
Question
dig redunda.com. NS
Answer
redunda.com. 2 NS ns-64-c.gandi.net.
redunda.com. 2 NS ns-154-a.gandi.net.
redunda.com. 2 NS ns-106-b.gandi.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0