Answer:
a. Trade publication
Step-by-step explanation:
A trade publication is a type of magazine or newspaper that focuses on a particular industry, profession, or trade. The content is typically geared towards professionals working in that field, providing them with news, information, and insights on industry-specific topics such as trends, technology, regulations, and best practices. Trade publications are usually not available to the general public, but are instead targeted at a specific audience of professionals who are interested in staying up-to-date with developments in their industry. These publications are an important resource for professionals to stay informed and competitive in their field.