Apex domains cannot have CNAME records.
Question and response
Question
dig static.telenor.dk. NS
Answer
static.telenor.dk. 5 NS ns2.telenor.dk.
static.telenor.dk. 5 NS ns1.telenor.dk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0