Apex domains cannot have CNAME records.
Question and response
Question
dig gallerygertrudestein.com. NS
Answer
gallerygertrudestein.com. 5 NS ns2.gallerygertrudestein.com.
gallerygertrudestein.com. 5 NS ns1.gallerygertrudestein.com.
Authority
The response has no authority records.
Additional
ns1.gallerygertrudestein.com. 5 A 5.135.118.101
ns2.gallerygertrudestein.com. 5 A 5.135.118.106
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0