Apex domains cannot have CNAME records.
Question and response
Question
dig adobe.com.ar. NS
Answer
adobe.com.ar. 5 NS ns201.adobe.net.
adobe.com.ar. 5 NS ns203.adobe.net.
adobe.com.ar. 5 NS ns202.adobe.net.
adobe.com.ar. 5 NS ns204.adobe.net.
adobe.com.ar. 5 NS ns205.adobe.net.
adobe.com.ar. 5 NS ns206.adobe.net.
Authority
The response has no authority records.
Additional
ns201.adobe.net. 3 A 204.74.108.252
ns202.adobe.net. 3 A 204.74.109.252
ns204.adobe.net. 3 A 199.7.69.252
ns205.adobe.net. 3 A 204.74.114.252
ns206.adobe.net. 3 A 204.74.115.252
ns201.adobe.net. 3 AAAA 2001:502:f3ff:0:0:0:0:e
ns202.adobe.net. 3 AAAA 2610:a1:1014:0:0:0:0:e
ns204.adobe.net. 3 AAAA 2001:502:4612:0:0:0:0:e
ns205.adobe.net. 3 AAAA 2610:a1:1016:0:0:0:0:e
ns206.adobe.net. 3 AAAA 2610:a1:1017:0:0:0:0:e
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0