Apex domains cannot have CNAME records.
Question and response
Question
dig paychex.com. NS
Answer
paychex.com. 5 NS a2-64.akam.net.
paychex.com. 5 NS a7-66.akam.net.
paychex.com. 5 NS a16-64.akam.net.
paychex.com. 5 NS a12-65.akam.net.
paychex.com. 5 NS a1-21.akam.net.
paychex.com. 5 NS a9-64.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0