What is the relationship between grocery and Walmart in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Walmart will offer the online grocery pickup at select stores in Atlanta; Charlotte and Fayetteville, N.C.; Salt Lake City; Ogden, Utah; Nashville, Tenn.; Tucson, Ariz.; and Colorado Springs, Colo.

Answer: operator