Read the following statements carefully

Y: The resistivity of semiconductor decreases with increase of temperature.

Z: In a conducting solid, the rate of collisions between free electrons and ions increases with increase of temperature.

Select the correct statement (s) from the following

In case of semiconductors as temperature increases electrons jump to conduction band resistance decreases Rαρ(Resistivity) so resistivity also decreases and current increases.

Vibration of electrons increases with rise in temperature and hence collision between ions and electrons increases with temperature.