The Purpose of a Trade Mark Is

The purpose of a trade mark is:

A) The same as the purpose of a business name in that both are a means of preventing others from reproducing a name.
B) Different from purpose of a business name: a business name, unlike a trademark, is designed to enable those dealing with a business to identify the people behind it.
C) The same as the purpose of a business name because registration of the business name, like a trademark, automatically prevents others from using the name to market products.
D) Different from the purpose of a business name: a trade mark, unlike a business name, is not intended to prevent others from using the name.