What is the function of the harmony in music?

I - It refers to the linear sequence of musical notes played or sung in sequential order.

II - It is the combination of different musical notes played or sung simultaneously, creating chords and chord progressions.

III - It is the organization of the times and durations of musical notes, based on regular beat patterns and accents.

IV - It is the element that gives support to the melody and can create different emotional sensations.