Apex domains cannot have CNAME records.
Question and response
Question
dig jazz.com.PK. NS
Answer
jazz.com.PK. 4 NS brian.ns.cloudflare.com.
jazz.com.PK. 4 NS ariadne.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0