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Consider the following statements regarding the cumulonimbus clouds

[a] This cloud is also referred to as thunder clouds.

[b] This brings convectional rain.

[c] This is frequently seen in tropical afternoons.

[d] These are woolly, bumpy clouds arranged in layers appearing like waves in blue sky.

Which of the above statements is/are not correct?

A)  2 only                        

B)  3 only

C)  1 and 4                      

D)  4 only