Consider the following statements regarding the cumulonimbus clouds
1. This cloud is also referred to as thunder clouds.
2. This brings convectional rain.
3. This is frequently seen in tropical afternoons.
4. 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