Williams $-$ Sonoma is a specialty store that caters to customers who like to cook at home. It offers free cooking classes, has frequent demonstrations by cookbook authors, and has employees who are knowledgeable about food preparation. The sales staff helps customers make their selections. Williams $-$ Sonoma is retailer.

a limited $-$ service

a full $-$ service

an upscale $-$ service

a self $-$ service

an exclusive $-$ service