Apex domains cannot have CNAME records.
Question and response
Question
dig provps.com. NS
Answer
provps.com. 4 NS ns3.ndchost.com.
provps.com. 4 NS ns1.ndchost.com.
provps.com. 4 NS ns2.ndchost.com.
provps.com. 4 NS ns4.ndchost.com.
Authority
The response has no authority records.
Additional
ns1.ndchost.com. 5 A 204.10.37.59
ns2.ndchost.com. 5 A 172.236.22.251
ns3.ndchost.com. 5 A 104.237.151.97
ns4.ndchost.com. 5 A 69.164.194.140
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0