A transistor is preferable to a triode valve when used in amplifier because it,
(i) can withstand larger changes in temperature
(ii) has higher input impedance
(iii) can handle larger power
(iv) does not require heater. Say, if only

Options

A. (i),(ii) and (iii) are correct
B. (i) and (iii) are correct
C. (ii) and (iv) are correct
D. (iv) is correct.