Apex domains cannot have CNAME records.
Question and response
Question
dig yellowpages-mauritius.com. NS
Answer
yellowpages-mauritius.com. 5 NS ns-1948.awsdns-51.co.uk.
yellowpages-mauritius.com. 5 NS ns-488.awsdns-61.com.
yellowpages-mauritius.com. 5 NS ns-1264.awsdns-30.org.
yellowpages-mauritius.com. 5 NS ns-1844.awsdns-38.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0