Apex domains cannot have CNAME records.
Question and response
Question
dig rapidsupport.com.PK. NS
Answer
rapidsupport.com.PK. 5 NS shane.ns.cloudflare.com.
rapidsupport.com.PK. 5 NS simone.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0