What are the four modes of presentation and what are the advantages and disadvantages of each?

What will be an ideal response?

Impromptu is adaptable to the situation but one can get lost and ramble if care is not taken to
structure the speech. Memorized was valued in the past but now speakers run the risk of ignoring
feedback, delivering the speech stiffly, and forgetting what they wanted to say. Manuscript is valuable in
formal situations where precision is important, but manuscripts distance the speaker from the audience,
limit eye contact and are difficult to deliver well. Extemporaneous speaking encourages conversational
quality and is flexible enough to permit adaptation to feedback. The text lists no downside to
extemporaneous speaking.