Consider the following minerals : 1. Bentonite 2. Chromite 3. Kyanite 4. Sillimanite In India, which of the above is/are officially designated as major minerals ?

1. (a)1 and 2 only
2. (b)4 only
3. (c)1 and 3 only
4. (d)2, 3 and 4 only