Ian purchases a digital thermometer to keep at his home. the instruction packet spells out how ian can change the default reading from celsius to fahrenheit. ian is taken aback because he lives in the united states. what does the presence of these options most likely indicate?
a. the company that makes the thermometer is trying to implement the metric system.
b. the thermometer might be sold in more than one country around the world.
c. the company that makes the thermometer is very old, using antiquated measurements.
d. the company that makes the thermometer is biased towards us customers.