Apex domains cannot have CNAME records.
Question and response
Question
dig acquirebpo.com. NS
Answer
acquirebpo.com. 5 NS ns-1162.awsdns-17.org.
acquirebpo.com. 5 NS ns-952.awsdns-55.net.
acquirebpo.com. 5 NS ns-288.awsdns-36.com.
acquirebpo.com. 5 NS ns-1817.awsdns-35.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0