Apex domains cannot have CNAME records.
Question and response
Question
dig bm.afilias-nst.org. NS
Answer
bm.afilias-nst.org. 5 NS b2.bm.afilias-nst.org.
bm.afilias-nst.org. 5 NS d0.bm.afilias-nst.org.
bm.afilias-nst.org. 5 NS a0.bm.afilias-nst.info.
bm.afilias-nst.org. 5 NS b0.bm.afilias-nst.org.
bm.afilias-nst.org. 5 NS a2.bm.afilias-nst.info.
bm.afilias-nst.org. 5 NS c0.bm.afilias-nst.info.
Authority
The response has no authority records.
Additional
b0.bm.afilias-nst.org. 5 A 199.254.60.9
b2.bm.afilias-nst.org. 5 A 199.249.124.9
d0.bm.afilias-nst.org. 5 A 199.254.62.9
b0.bm.afilias-nst.org. 5 AAAA 2001:500:26:0:0:0:0:9
b2.bm.afilias-nst.org. 5 AAAA 2001:500:4c:0:0:0:0:9
d0.bm.afilias-nst.org. 5 AAAA 2001:500:28:0:0:0:0:9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0