Apex domains cannot have CNAME records.
Question and response
Question
dig sugar.co.ke. NS
Answer
sugar.co.ke. 4 NS pdns104.ultradns.org.
sugar.co.ke. 4 NS pdns104.ultradns.net.
sugar.co.ke. 4 NS pdns104.ultradns.biz.
sugar.co.ke. 4 NS pdns104.ultradns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0