Charlie is a voracious reader. He finds it inconvenient to go to a bookstore every time he needs new books. To make things easier, he purchased an e$-$book reader. He is delighted with this new device as it has a built$-$in dictionary and acts like a portable library with an added option to store multiple books. In the given scenario, Charlie is in the stage of the basic consumption process.

a$.$ need

b$.$ exchange

c$.$ want

d$.$ benefit