Which of the following sentences are true?a. In resistive thermometer, the change in resistance of material per unit change in temperature should be as small as possible.b. Thermometers are semiconductors which behave as resistors with high positive temperature coefficient.c. Thermometers are composed of metallic oxides.d. Thermometers are used for the measurement of level flow and pressure of fluids.

• A. a and b are true
• B. b and c are true
• C. a and c are true
• D. only d is true