Which among the following statements is/are true?
Exposure of silver chloride to sunlight for a long duration turns grey due to
1. the formation of silver by decomposition of silver chloride
2. sublimation of silver chloride
3. decomposition of chlorine gas from silver chloride
4. oxidation of silver chloride
a. Only 1
b. 1 and 3
c. 2 and 3
d. Only 4
e. None of the above/More than one of the above