Apex domains cannot have CNAME records.
Question and response
Question
dig guide4city.com. NS
Answer
guide4city.com. 5 NS ns-1735.awsdns-24.co.uk.
guide4city.com. 5 NS ns-469.awsdns-58.com.
guide4city.com. 5 NS ns-731.awsdns-27.net.
guide4city.com. 5 NS ns-1449.awsdns-53.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0