Apex domains cannot have CNAME records.
Question and response
Question
dig hcl.com. NS
Answer
hcl.com. 4 NS ns01.hcl.com.
hcl.com. 4 NS ns04.hcl.com.
hcl.com. 4 NS ns02.hcl.com.
hcl.com. 4 NS ns05.hcl.com.
Authority
The response has no authority records.
Additional
ns01.hcl.com. 4 A 192.8.220.7
ns02.hcl.com. 4 A 192.8.220.6
ns04.hcl.com. 4 A 192.8.186.143
ns05.hcl.com. 4 A 52.172.9.119
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0