Which of the following statements related to clouds is/are correct ? 1. Clouds are classified on the basis of their height and form. 2. According to height they are classified as high, middle and low clouds. 3. Stratus, nimbostratus and stratocumulus clouds are high clouds. Select the correct answer using the code given below :

Clouds are indeed classified on the basis of their height (altitude) and form (shape and appearance), so statement 1 is correct. Based on height, clouds are classified into high (cirrus, cirrostratus, cirrocumulus), middle (altostratus, altocumulus), and low clouds (stratus, nimbostratus, stratocumulus), so statement 2 is correct. Statement 3 is incorrect because stratus, nimbostratus and stratocumulus are LOW clouds, not high clouds. Hence only statements 1 and 2 are correct.