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In an electronic circuit, a thermocouple can be used to ____.

A open or close a circuit at a designated temperature
Explaination
A thermocouple is a temperature sensor that consists of two wires made from different conductors. The junction of these two wires produces a voltage based on the temperature difference between them and can be used like a switch to open or close the circuit at a designated temperature.
B link the temperature of one component in the circuit to that of another component in the circuit
C increase or decrease the temperature of a component in the circuit
D keep the circuit at a designated safe temperature