Apex domains cannot have CNAME records.
Question and response
Question
dig optic.gob.do. NS
Answer
optic.gob.do. 5 NS woz.ns.cloudflare.com.
optic.gob.do. 5 NS kiki.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
woz.ns.cloudflare.com. 3 A 108.162.193.150
woz.ns.cloudflare.com. 3 A 172.64.33.150
woz.ns.cloudflare.com. 3 A 173.245.59.150
kiki.ns.cloudflare.com. 3 A 108.162.192.180
kiki.ns.cloudflare.com. 3 A 172.64.32.180
kiki.ns.cloudflare.com. 3 A 173.245.58.180
woz.ns.cloudflare.com. 3 AAAA 2606:4700:58:0:0:0:adf5:3b96
woz.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c196
woz.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:2196
kiki.ns.cloudflare.com. 3 AAAA 2606:4700:50:0:0:0:adf5:3ab4
kiki.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c0b4
kiki.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:20b4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0