Clouds are the masses of small water droplets or tiny ice crystals.
(A) Clouds are classified according to their appearance and height.
(B) Cirrus clouds are high altitude clouds, which are usually feathery shaped and composed entirely of ice crystals.
(C) Nimbostratus clouds are mid level clouds producing sporadic rain.
(D) Altocumulus are the heap-like clouds having flat bases and rounded tops.
Choose the correct answer from the options given below: