An ice cream shop owner wants to find out what new flavor of ice cream he should sell in his shop. which method would be the best way for the owner to do this?

a) determine which flavor is the best selling now.
b) visit all the other ice cream store and see what flavors they sell.
c) ask each regular customer which flavor they would like to see in his shop.
d) have the computer randomly generate 100 customers from his database and survey them.