A speaker's credibility is affected above all by Competence and Character the audience regards the speaker's.
Speaker credibility is the credibility the speaker brings to the speaking stage. It consists of credentials that authorize a person to speak on the topic presented. Without the credibility of the speaker, the speech itself cannot be credible.
Speech experts have identified three types of credibility: initial credibility—the credibility the speaker has before the speech begins; inferred credibility – the credibility that the speaker acquires during the speech; and terminal credibility—the credibility of the speaker after the speech.
Hence, the correct answer is Competence and Character
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