Which of the following statements regarding clouds is/are correct? 1. Clouds are classified on the basis of altitude and their form. 2. According to altitude they are classified as High, Middle and Low clouds. 3. Stratus, Nimbostratus and Stratocumulus are high clouds. Select the answer using the code given below:

Clouds are classified based on both altitude (height of occurrence) and form (shape/appearance), so Statement 1 is correct. On the basis of altitude, clouds are classified as High clouds (cirrus, cirrostratus, cirrocumulus), Middle clouds (altostratus, altocumulus) and Low clouds (stratus, stratocumulus, nimbostratus), so Statement 2 is correct. However, Stratus, Nimbostratus and Stratocumulus are LOW clouds, not high clouds, so Statement 3 is incorrect. Hence only statements 1 and 2 are correct.