Final answer:
Alberta is using a memorized speech delivery technique, where she recites the speech from memory without any notes. This method is distinct from extemporaneous, impromptu, and manuscript delivery styles.
Step-by-step explanation:
Alberta is using the memorized delivery technique. This method involves committing an entire speech to memory and delivering it without the use of notes. This type of delivery requires substantial practice to ensure that the speaker can recall the speech accurately under the pressure of presenting to an audience.
It is different from the other options because extemporaneous speaking involves speaking with a few notes or an outline rather than a fully written speech; impromptu speaking is delivered on the spot without preparation; and manuscript speaking requires reading from a written text.