Apex domains cannot have CNAME records.
Question and response
Question
dig zohosubscriptions.com. NS
Answer
zohosubscriptions.com. 2 NS pdns90.ultradns.biz.
zohosubscriptions.com. 2 NS dns4.p03.nsone.net.
zohosubscriptions.com. 2 NS dns3.p03.nsone.net.
zohosubscriptions.com. 2 NS ns1.zohocorp.com.
zohosubscriptions.com. 2 NS dns2.p03.nsone.net.
zohosubscriptions.com. 2 NS pdns90.ultradns.net.
zohosubscriptions.com. 2 NS pdns90.ultradns.org.
zohosubscriptions.com. 2 NS dns1.p03.nsone.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0