Consider the following statements :

1. Troposphere varies in its thickness between equator and poles.

2. Stratosphere does not experience Normal Lapse Rate.

3. Ozone layer occurs in the Mesosphere.

4. Ionosphere lies between Stratosphere and Mesosphere.

Which of these statements are correct ?

(a) 1 and 2 (b) 2 and 3 (c) 3 and 4 (d) 1, 2 and 4

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