To ensure that their speech will be effective, speakers can focus on the following two correct answers:
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By using proper diction and syntax - Clear and appropriate language helps convey the intended message effectively.
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By using rhetorical strategies - Employing rhetorical devices can engage the audience and enhance the overall impact of the speech.
The other options, such as using logical fallacies or a mix of formal and informal terms, may not lead to effective communication. Using sensitive language can be helpful, but it is not as fundamental as the first two choices mentioned.