Which of the following statements correctly describes wave propagation?
a) Wave is a form of energy that propagates without displacing the particles of the medium.
b) Wave is a form of energy that propagates by producing a net displacement of the particles of the medium.
c) Wave is a form of energy that propagates without producing a net displacement of the particles of the medium.
d) Wave is a form of energy that does not require a material medium for propagation.