Apex domains cannot have CNAME records.
Question and response
Question
dig pc2linux.com. NS
Answer
pc2linux.com. 2 NS ns9.zoneedit.com.
pc2linux.com. 2 NS ns8.zoneedit.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0