Roland Manages a Large Antique Mall Housing 200 Vendors and Welcoming

Roland manages a large antique mall housing 200 vendors and welcoming 150,000 shoppers annually.He has strived to increase his overall sales each year.Up until a year ago,his advertising was limited to signage along the local highway.For one year now,he has been advertising in antique magazines and regional newspapers in order to increase sales in the mall.How should Roland begin with evaluating the results of his advertising campaign?

A) inquire with vendors about loyal customers
B) count patrons
C) compare the sales of this year to prior years
D) survey customers about their awareness of antique malls
E) all of the above