Take context from the input text and decide on the accurate relationship between 'grocery' and 'Walmart' from the options provided.
Options: platform, subsidiary, location of formation, operator

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.
operator