Which statement best describes the relationship between superclass and subclass types?
a. A subclass reference cannot be assigned to a superclass variable and a superclass reference cannot be assigned to a subclass variable.
b. A subclass reference can be assigned to a superclass variable and a superclass reference can be assigned to a subclass variable.
c. A superclass reference can be assigned to a subclass variable, but a subclass reference cannot be assigned to a superclass variable.
d. A subclass reference can be assigned to a superclass variable, but a superclass reference cannot be assigned to a subclass variable.
d. A subclass reference can be assigned to a superclass variable, but a superclass reference cannot be assigned to a subclass variable.
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