Assume one reference variable’s class is descended from another reference variable’s class. To b

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Step 1: Identify the relationship between the two reference variables. One reference variableu0027s

Assume one reference variable’s class is descended from another reference variable’s class. To be able to assign one reference variable to the other one (without using a cast operator), the left-side variable’s class must be a(n) ______________ of the right-side reference variable’s class.