Apex domains cannot have CNAME records.
Question and response
Question
dig hosted.systemlifeline.com. NS
Answer
hosted.systemlifeline.com. 5 NS ns4.systemlifeline.com.
hosted.systemlifeline.com. 5 NS ns3.systemlifeline.com.
Authority
The response has no authority records.
Additional
ns3.systemlifeline.com. 5 A 23.176.0.94
ns4.systemlifeline.com. 5 A 23.176.0.188
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0