Final answer:
Ammonium thioglycolate waves are the permanent wave process that works at room temperature.
Step-by-step explanation:
The correct answer is d. Ammonium thioglycolate waves.
Ammonium thioglycolate waves, also known as thio waves, are a type of permanent wave process that work at room temperature. They are commonly used to create curls or waves in the hair.
In contrast, alkaline waves, acid waves, and exothermic waves all require heat to be applied during the process. Alkaline waves use heat from a hair dryer or heat cap, acid waves require a heat source like a hood dryer or steam, and exothermic waves produce their own heat through a chemical reaction.