Correct Option: D

The Indian Santoor is an ancient string musical instrument native to Jammu and Kashmir, with origins in Persia. A primitive ancestor of this type of instruments was invented in Mesopotamia (1600-911 BC). The Santoor is a trapezoid-shaped hammered dulcimer often made of walnut, with seventy two strings. The special-shaped mallets (mezrab) are lightweight and are held between the index and middle fingers. A typical Santoor has two sets of bridges, providing a range of three octaves.