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 :

According to standard meteorological classification, clouds are categorized based on two main criteria: their physical form (appearance) and their altitude (height). Thus, Statement 1 is correct.

Based on altitude, clouds are grouped into three levels: High clouds (above 6,000m), Middle clouds (2,000m–6,000m), and Low clouds (below 2,000m). This makes Statement 2 correct.

Statement 3 is incorrect because Stratus, Nimbostratus, and Stratocumulus are classified as low clouds, as their bases are typically found below 2,000 meters. High clouds generally include Cirrus, Cirrostratus, and Cirrocumulus, which are composed of ice crystals. Middle clouds are usually identified by the prefix 'Alto-' (e.g., Altostratus and Altocumulus).