Consider the following statements regarding the vegetation of Rajasthan desert and choose the correct answer:
1. Sand community occupies a large area of Jaisalmer and near about areas
2. Gravel association at Bap to Jaisalmer consists of Boerhhavia diffusa, Cleome papillosa, Fagonia eratea, Aristidia mutabilis etc.
3. Except small isolated hills, the greater portions of Jaisalmer and Jodhpur of Rajasthan are covered by rocks
4. The common shrubs occurring in the sand, gravel and rock communities are Euphorbia nerifolia, some species of twining shrubs like species of Convolvulus, Sarcostemma etc.

A. Only 1, 2 and 3 are true

B. Only 2 and 4 are true

C. Only 2, 3 and 4 are true

D. Only 3 and 4 are true

Answer: Option C