Apex domains cannot have CNAME records.
Question and response
Question
dig infinet.co.ke. NS
Answer
infinet.co.ke. 5 NS ns1.infinet.co.ke.
infinet.co.ke. 5 NS ns2.infinet.co.ke.
infinet.co.ke. 5 NS ns3.infinet.co.ke.
infinet.co.ke. 5 NS ns4.infinet.co.ke.
Authority
The response has no authority records.
Additional
ns1.infinet.co.ke. 5 A 41.207.64.4
ns2.infinet.co.ke. 5 A 41.207.64.2
ns3.infinet.co.ke. 5 A 41.207.64.3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0