Apex domains cannot have CNAME records.
Question and response
Question
dig resources.indosat.com. NS
Answer
resources.indosat.com. 5 NS ns2.indosat.com.
resources.indosat.com. 5 NS ns4.indosat.com.
Authority
The response has no authority records.
Additional
ns2.indosat.com. 5 A 202.152.165.36
ns4.indosat.com. 5 A 202.93.40.174
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0