Apex domains cannot have CNAME records.
Question and response
Question
dig pcpie.com. NS
Answer
pcpie.com. 4 NS dns20.hichina.com.
pcpie.com. 4 NS dns19.hichina.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0