Solid form of carbon dioxide is also known as:

The correct answer is option 1. Dry ice.

Solid form of carbon dioxide is also known as Dry ice. Dry ice is the solid form of carbon dioxide \((CO_2)\) at temperatures below -78.5°C (-109.3°F). It is called "dry ice" because it sublimates directly from a solid to a gas without passing through the liquid phase, leaving behind no liquid residue. Dry ice is commonly used as a cooling agent in various applications such as food preservation, transportation of perishable goods, and special effects in entertainment.