Explanation:

- Newspapers are typically intended for general readership, focusing on broad interests and general information.

- Similarly, professional journals are usually designed for audiences with specialized knowledge or interest in specific fields.

- Researchers ? are the primary audience for professional journals, as these publications often present detailed studies, findings, and reviews on particular subjects.

- Customers often refer to individuals who buy products or services, not typically related to professional journals.

- Technicians may utilize information from journals but are not the primary audience.

- Literates simply refer to people who can read, which is too broad for this context.

Correct Answer: Option 2 - Researchers