Question: If the temperature drops below 1 5 degrees, the heater is turned ON . When the temperature reaches 2 0 degrees, the heater is turned

If the temperature drops below 15 degrees, the heater is turned ON. When the temperature reaches 20 degrees, the heater is turned OFF. What is the minimum set of test input values to cover all valid equivalence partitions?
1
a.
15,17,21
b.
16,19,20
c.
14,15,19
d.
12,18,22

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