Apex domains cannot have CNAME records.
Question and response
Question
dig peapod.com. NS
Answer
peapod.com. 5 NS ns6.peapod.com.
peapod.com. 5 NS ns4.peapod.com.
peapod.com. 5 NS ns5.peapod.com.
Authority
The response has no authority records.
Additional
ns4.peapod.com. 5 A 162.159.0.76
ns5.peapod.com. 5 A 162.159.1.76
ns6.peapod.com. 5 A 162.159.2.29
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0