Which one of the following is called dry ice?

Dry ice is the solid form of carbon dioxide (CO2). It is a frozen gas that transitions directly from a solid state to a gaseous state through a process called sublimation, bypassing the liquid phase entirely under normal atmospheric conditions. This unique property makes it an ideal cooling agent for transporting perishable items, as it leaves no liquid residue. Industrially, it is produced by purifying and liquefying carbon dioxide gas, which is then allowed to expand rapidly in an expansion chamber. This rapid expansion causes cooling and the formation of 'dry ice snow,' which is subsequently compressed into solid blocks or pellets. Unlike regular ice made from water, dry ice is non-toxic, non-flammable, and significantly colder, with a surface temperature of approximately -78.5 degrees Celsius.