Apex domains cannot have CNAME records.
Question and response
Question
dig voog.com. NS
Answer
voog.com. 5 NS ns2.voog.com.
voog.com. 5 NS ns1.voog.com.
voog.com. 5 NS ns.voog.in.
Authority
The response has no authority records.
Additional
ns.voog.in. 5 A 46.101.14.198
ns1.voog.com. 5 A 85.222.234.11
ns2.voog.com. 5 A 85.222.234.12
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0