Apex domains cannot have CNAME records.
Question and response
Question
dig granderiver.com. NS
Answer
granderiver.com. 1 NS nsb.rgvw.net.
granderiver.com. 1 NS bilbo.granderiver.com.
granderiver.com. 1 NS nsf.vtx1.net.
granderiver.com. 1 NS nsa.rgvw.net.
granderiver.com. 1 NS nsg.vtx1.net.
granderiver.com. 1 NS nsa.vtx1.net.
granderiver.com. 1 NS ns2.granderiver.com.
granderiver.com. 1 NS nsd.vtx1.net.
granderiver.com. 1 NS nsc.vtx1.net.
granderiver.com. 1 NS nse.vtx1.net.
granderiver.com. 1 NS nsb.vtx1.net.
Authority
The response has no authority records.
Additional
ns2.granderiver.com. 1 A 216.183.32.7
bilbo.granderiver.com. 1 A 216.183.32.6
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0