Option 1 -> (A), (B), and (D) are correct statements about cloud classification and types.
Option 2 -> (C) is incorrect because nimbostratus produces continuous rain, not sporadic.
Option 3 -> (C) is incorrect; nimbostratus clouds produce steady, continuous precipitation, not sporadic rain.
Option 4 -> (C) is incorrect due to the same reason above.
Hence, Option 1: (A), (B) and (D) only -> Statement (A) correctly describes cloud classification by appearance and height; Statement (B) accurately describes cirrus clouds as high-altitude, feathery, ice crystal clouds; Statement (D) correctly describes altocumulus clouds as heap-like with flat bases and rounded tops. Statement (C) is FALSE because nimbostratus clouds produce continuous, steady rain, not sporadic rain -> correct