Which strategy below is most advisable for increasing one's credibility?

Question

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Identifying a source's qualifications prior to presenting information from that source increases one's credibility by demonstrating that the information is reliable and comes from a credible source. A) Emphasizing differences can create distance and alienate listeners. B) Spontaneity may lead to errors and lack of preparation can decrease credibility. C) Always adopting a formal language style may create a barrier between the speaker and the audience.

Which Strategy Below Is Most Advisable for increasing One's Credibility