With respect to powerful brand elements, is an extremely efficient means to build brand equity. this element functions as a useful "hook" or "handle" to consumers grasp what the brand is and what makes it special.
a) the tangibility of a product
b) a product's shape
c) a slogan
d) a patent
e) a copyright

C) a slogan

Explanation:

A slogan is a series of catchy words or a phrase that companies use to help consumers remember their brand or product name. Slogans are memorable and help customers relate a product to a need. The aim of creating a slogan is for the phrase to stick in customer's minds. If the customers need a product or services with a variety of suppliers, then they will pick what comes to their mind first.

Slogans may contain a few words but may time weeks or months to develop. Businesses use slogans for advertising and for communicating the essence of the brand.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link :

i would say that they would most likely use a e-mail