The collision-coalescence process of precipitation refers to the formation of raindrops through the collision and merging of smaller water droplets in the atmosphere. The process occurs in warm clouds, where the temperature remains above freezing.

Option 1 states that the collision-coalescence process is applicable to clouds that do not extend beyond the freezing level. This means that the process occurs in clouds that have a vertical range where the temperature remains above freezing throughout. In these clouds, the water droplets that make up the cloud collide and combine to form raindrops.

Option 2 suggests that the process is applicable to clouds that extend beyond the freezing level. While this may seem reasonable, it is incorrect. It is important to note that the collision-coalescence process cannot occur in clouds where the temperature drops below freezing, as the water droplets would freeze into ice particles instead of merging into raindrops.

Option 3 states that the process is applicable to all types of clouds. This is not entirely accurate, as the collision-coalescence process is limited to warm clouds where the temperature remains above freezing.

Option 4 specifies cumulonimbus clouds. While it is true that cumulonimbus clouds are capable of producing precipitation through other processes such as ice crystal formation or supercooling,