In his e-mail to select bank customers, Patrick was careful to use an informative subject line and to use a font size and style that is easy to read. These preparations serve what function in this communication scenario

"Netiquette" is the correct answer to the given question.  

Explanation:

Netiquette is known as  Internet etiquette. Netiquette means using of the internet in the good manners of communication like email, forums, etc. The main aim of Netiquette allows users to build and maintain personal and corporate relationships.

With the help of netiquette, Patrick was careful to use a descriptive subject line and to use an easy-to-read font size and layout in his email to select the details of bank customers.

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