Which of the following statements are correct for superconductors?
1. A substance loses its electrical resistance below certain temperature.
2. Superconducting elements have greater electrical resistivity at room temperature.
3. On adding impurities to super conducting elements its transition temperature is increased.

A. 1, 2 and 3

B. 1 and 2 only

C. 1 and 3 only

D. 2 and 3 only

Answer: Option C