Identify the cloud on the basis of the following characteristics relating to it : I. They look like cotton wool. II. They exist in patches and have flat base. III. They are generally formed at a height of 4 to 7 km. Select the answer using the code given below :

Cumulus clouds are described as cotton-wool-like puffy clouds with a flat base, occurring in patches at altitudes of about 4 to 7 km. Cirrus clouds are thin, feathery, and form at very high altitudes (above 8 km). Nimbus clouds are dark, low-altitude rain-bearing clouds. Stratus clouds form low layered sheets covering the sky. The characteristics described—cotton-wool appearance, flat base, and 4–7 km altitude—match cumulus clouds, as described in standard NCERT geography texts.