Apex domains cannot have CNAME records.
Question and response
Question
dig ferris.edu. NS
Answer
ferris.edu. 4 NS wheel.ferris.edu.
ferris.edu. 4 NS fsudc3.ferris.edu.
ferris.edu. 4 NS fsudc4.ferris.edu.
ferris.edu. 4 NS fsudc5.ferris.local.
ferris.edu. 4 NS wheel2.ferris.edu.
ferris.edu. 4 NS fsudc1.ferris.edu.
ferris.edu. 4 NS fsudc2.ferris.edu.
Authority
The response has no authority records.
Additional
wheel.ferris.edu. 4 A 161.57.5.2
wheel2.ferris.edu. 4 A 161.57.5.6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0