Apex domains cannot have CNAME records.
Question and response
Question
dig csp.edu. NS
Answer
csp.edu. 5 NS ns-913.awsdns-50.net.
csp.edu. 5 NS ns-1816.awsdns-35.co.uk.
csp.edu. 5 NS ns-190.awsdns-23.com.
csp.edu. 5 NS ns-1063.awsdns-04.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0