Which of the following are true about speed of sound?
(i) Sound propagates through a medium at a finite speed.
(ii) The speed of sound decreases when we go from solid to gaseous state.
(iii) Speed of sound increases with increase in temp.
(a) only (i)
(b) (i) & (iii)
(c) (i), (ii) & (iii)
(d) (i) & (ii)
