Speaking from memory is option(d) i.e, can be successful for toasts or introductions.
Speaking from memory involves reciting verbatim a written message that has been committed to memory by the speaker. Every time they act out a scene from a play, television show, or movie screenplay, actors, of course, recite from memory.
Memorization has the benefit of allowing the speaker to keep eye contact with the audience the entire speech. Without notes, you are free to wander about the stage and create movements with your hands.
The benefit of remembering your speech is that you can organize every word and maximize your speaking time. You can make good eye contact because you won't have to look at your notes. The drawback of memorization is that you risk sounding stale and that your audience might view it more as a performance than a speech.
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