I believe the correct answer is the last statement: Actors’
dialogue, sound effects, and background music.
Actors’ dialogue, sound effects, and background music make
up a film’s soundtrack during the post-production process. Audio
post-production is general term for all the stages of production from actual
recording to completion of a master recording which involves sound design,
sound editing, audio mixing, and the addition of effects. Sometimes the
original dialogs lacks in performance or quality, and the actor is brought into
a sound studio to record again. The foley, music, and voiceover, are also added
during post production.
