Apex domains cannot have CNAME records.
Question and response
Question
dig liveperson.net. NS
Answer
liveperson.net. 5 NS a12-64.akam.net.
liveperson.net. 5 NS a1-175.akam.net.
liveperson.net. 5 NS a3-64.akam.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0