Which of the statements about glass are correct?_x000D_ 1. Glass is a super-cooled liquid having infinite viscosity_x000D_ 2. Violet coloured glass is obtained by adding MnO2_x000D_ 3. Glass is a man-made silicate_x000D_ 4. Glass is a crystalline substance_x000D_ Select the correct answer using the code given below:

Which of the statements about glass are correct?_x000D_ 1. Glass is a

1.	Which of the statements about glass are correct?_x000D_ 1. Glass is a super-cooled liquid having infinite viscosity_x000D_ 2. Violet coloured glass is obtained by adding MnO2_x000D_ 3. Glass is a man-made silicate_x000D_ 4. Glass is a crystalline substance_x000D_ Select the correct answer using the code given below:
A.	1, 2 and 3
B.	1, 2 and 4
C.	2, 3 and 4
D.	1 and 3 only
Answer» B. 1, 2 and 4