Answer:
A superclass object is a subclass object.
Explanation:
By definition, in OOP (Object Oriented Programming), the inheritance concept defines two kind of classes:
A subclass, this is also known as the child class, which inherits from another class.
A superclass, this is also known as the parent class, which other classes inherit (or extends) from.
Isosceles trapezoid would be a trapezoid with equal base angles and hence equal length on the lateral sides, and further discussion can be defined as follows:
Therefore, the answer is "one line of symmetry".
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B. small icons.
C. background.
D. mouse properties.