Which pair of features is essential to object-oriented programming?

Answer: B. Abstraction/Encapsulation and Polymorphism with Inheritance — Core OOP requires encapsulation/abstraction and polymorphism with inheritance. Strict typing, concurrency, or GC are not essential features.

1. A.

   Strictly-typed variables and subtype safety

2. B.

   Abstraction/Encapsulation and Polymorphism with Inheritance

3. C.

   Concurrency and modularity

4. D.

   Garbage collection and memory management

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