Apex domains cannot have CNAME records.
Question and response
Question
dig lincolnucasf.edu. NS
Answer
lincolnucasf.edu. 3 NS cmtu.mt.ns.els-gms.att.net.
lincolnucasf.edu. 3 NS cbru.br.ns.els-gms.att.net.
Authority
The response has no authority records.
Additional
cbru.br.ns.els-gms.att.net. 1 A 68.94.156.132
cmtu.mt.ns.els-gms.att.net. 1 A 99.99.99.132
cbru.br.ns.els-gms.att.net. 1 AAAA 2001:1890:1ff:9f0:68:94:156:132
cmtu.mt.ns.els-gms.att.net. 1 AAAA 2001:1890:1ff:9f1:99:99:99:132
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0