Apex domains cannot have CNAME records.
Question and response
Question
dig pioneeronline.com. NS
Answer
pioneeronline.com. 3 NS ns5.ctrls.in.
pioneeronline.com. 3 NS ns4.ctrls.in.
Authority
The response has no authority records.
Additional
ns4.ctrls.in. 3 A 182.18.166.50
ns5.ctrls.in. 3 A 103.231.77.205
ns4.ctrls.in. 3 AAAA 2400:3b00:1:5:0:0:0:50
ns5.ctrls.in. 3 AAAA 2400:3b00:20:4:0:0:0:d5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0