Which one of the following is the characteristic vegetation of regions between the snow line and about 3000 meters above mean sea level of the Himalayan region? [CDS 2000] (a) Thick forests of birch, fir, spruce and other trees (b) Forests of oak, deodar, chestnut and maple trees (c) A few dwarf shrubs (d) Forests of khair, sandalwood, palas and other trees