A speaker who plans the content, organization, and delivery of the speech in advance, but does not write the speech out word for word, uses extemporaneous speech delivery method.
Extemporaneous speeches are developed through outlining ideas, not writing them out word for word. They are practiced in advance and rehearsed (unprepared speeches are not improvised), a key word outline consisting of individual words and short 3-5 word phrases is used. It is used to achieve more about natural tone, natural style and natural flow with the listeners.
Hence, the correct answer is extemporaneous.
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