Passive constructions in formal English often involve complex transformations such as the "personal passive" and the use of deponents or pseudo-passives. Analyze the following statements regarding the transformation of active clauses into formal passive structures:

I. The sentence "They believe he is a genius" can be formally transformed into "He is believed to be a genius."
II. In the impersonal passive construction "It is said that...", the dummy subject "it" refers back to a specific preceding noun in the text.
III. The "get-passive" is considered more formal than the "be-passive" and is preferred in high-level legal and academic publications.

Which of the following are CORRECT: