If the heater in a fixed IEC bimetallic overload relay fails, _____.
a. the heater must be replaced with a heater of the same size
b. it and all the other heaters in the overload relay must be replaced
c. the entire overload relay must be replaced
d. the heater can be replaced with a heater of the same size or one that is slightly smaller
c. the entire overload relay must be replaced
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