P-O-P Displays Have Historically Served Several Purposes for Store Owners

P-O-P displays have historically served several purposes for store owners.What do today's retailers increasingly expect P-O-P displays to do for them? 

A)  To provide ambience and differentiate their store from others  
B)  To minimize the costs of creating displays for the store 
C)  To improve the orderliness and structure of the store environment 
D)  To reduce the number of sales personnel required