Bolve technologies is a small-scale smartphone manufacturer. it advertises its phones via television commercials. customers can buy these phones only by placing a call to the sales reps of bolve technologies. it is evident that bolve technologies is engaged in

direct response retailing

Explanation:  

Direct response retailing -

It is the method , by which the the people can advertise for their goods and services , via , television , radio or newspaper , by providing , the information about the product , along with some contact detail like email address , phone number , by which the people can enjoy the goods and services , is referred to as direct response retailing .

Hence, from the question,

Bolve Technologies , are advertising for their product via television , and hence are adapting the direct response retailing.

the density would be a smaller number.

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