Apex domains cannot have CNAME records.
Question and response
Question
dig uvg.edu.gt. NS
Answer
uvg.edu.gt. 5 NS xvm-189-73.dci0.ghst.net.
uvg.edu.gt. 5 NS ns2.uvg.edu.gt.
uvg.edu.gt. 5 NS ns.uvg.edu.gt.
uvg.edu.gt. 5 NS ns3.uvg.edu.gt.
Authority
The response has no authority records.
Additional
ns.uvg.edu.gt. 5 A 217.70.189.73
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0