Emma knows that a potential customer has four basic qualifications :they need the product, they are able to afford the purchase, they are willing to buy the product, and $\_\_\_\_\_\_\_.$

Question $2$ Select one:

a$.$

they will refer others to buy the product.

b$.$

they will use the product.

c$.$

they will return for other products.

d$.$

they are part of a buying centre.

e$.$

they are authorized to buy the product.