Apex domains cannot have CNAME records.
Question and response
Question
dig ps. NS
Answer
ps. 5 NS ps-ns.anycast.pch.net.
ps. 5 NS ote.pnina.ps.
ps. 5 NS ps.cctld.authdns.ripe.net.
ps. 5 NS ns1.pnina.ps.
ps. 5 NS Bilal.pnina.ps.
ps. 5 NS rip.psg.com.
ps. 5 NS fork.sth.dnsnode.net.
Authority
The response has no authority records.
Additional
ns1.pnina.ps. 25485 A 194.6.225.20
bilal.pnina.ps. 25485 A 168.119.39.120
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0