Answer:
number of strings
kudyapi 2
Lute 15
violin 4
guitar 6
Main material used
kudyapi➡ log of Jack fruit tree
Lute ➡flat plate of resonant wood (typically spruce)
Violin ➡spruce, willow, maple, ebony and rosewood
Guitar ➡Mahogany, Ash, Maple, Basswood, Agathis, Alder, Poplar, Walnut, Spruce, and holly
Number of frets
Kudyapi 9 frets
Lute lute is plucked or strummed with one hand while the other hand “frets” (presses down
Violin none frets
Guitar guitar have between 19–24 frets