Which temperature range represents what is called “the temperature danger zone” for consumers and…

Which temperature range represents what is called “the
temperature danger zone” for consumers and retailers, respectively, in food
safety?

a. between 20°F/–7°C and 80°F/27°C; between 21°F/–6°C and
75°F/24°C

 b. between 80°F/27°C and 180°F/82°C; between 81°F/27°C and
175°F/79°C

c. between 40°F/4°C and 140°F/60°C; between 41°F/5°C and
135°F/57°C

d. between 60°F/16°C and 160°F/71°C; between 61°F/16°C and
155°F/68°C