The source qualifier is A. the speaker's credentials. B. a brief description of the source's qualifications to address the topic. C. the main point the source supports. D. how a speaker determines the usefulness of a potential source.

B. a brief description of the source's qualification to address the topic.

Explanation:

The source qualifier is a brief description of the source's qualifications to address the topic.

Source Qualifier is used to grab data from a source file.

The source data types is converted to Informatica native data types using the source qualifier transformation

The specific citation elements that need to be mentioned in a speech depend on the type of source.