Object-Oriented Programming

In rule engine APIs, 'IirContext' represents a rule engine instance or session. It provides the context for executing rules and managing working memory. 'IIrReflect' deals with introspection, 'IirRuleEngine' and 'IirRule' are not standard interface names in common rule engine APIs.

In C++, the scope resolution operator :: is used to define member functions outside the class definition, specifying which class the function belongs to.

If no constructor is explicitly declared in a class, the compiler automatically provides a default, no-argument constructor. This ensures that every class always has at least one constructor function available for object instantiation.

Constructors can be overloaded by defining multiple constructors with different parameter lists, allowing objects to be initialized in different ways.

Abstract classes cannot be instantiated directly. They serve as base classes and must be inherited by concrete classes that implement all pure virtual functions.

To solve this question, the user needs to know the concept of access modifiers in object-oriented programming and their default level assigned to the members of a class.

Now, let's go through each option and explain why it is right or wrong:

A. Public: This option is incorrect. Public access modifier allows members of a class to be accessible from anywhere in the program. However, it is not the default access level assigned to members of a class.

B. Protected: This option is incorrect. Protected access modifier allows the members of a class to be accessible within the class and its subclasses. However, it is not the default access level assigned to members of a class.

C. Private: This option is correct. Private access modifier allows the members of a class to be accessible within the class only. It is the default access level assigned to the members of a class if no other access modifier is explicitly specified.

D. Default: This option is incorrect. Default access modifier allows the members of a class to be accessible within the package only. It is not the default access level assigned to the members of a class.

The Answer is: C

Overloading occurs at compile-time when functions with the same name have different parameters. Overriding happens at runtime when a derived class provides a new implementation for a base class virtual function.

A function template in C++ defines a general set of operations that can be applied to various types of data passed as parameters. While a class template defines a family of classes, a function template specifically represents operations (functions). Therefore, 'Both a and c' is incorrect.

C++ does not support virtual constructors. Object construction requires knowing the exact type at compile-time. Virtual destructors exist and are important for proper cleanup of derived class objects through base pointers.

Model chaining in Pega requires that the parent class has a model with the same name as the child class model (a), and the child class model has 'Call Super Class Model' enabled (b). Pattern inheritance (c) is a different inheritance mechanism and is not required for model chaining.

A subclass is a separate class that inherits properties and behaviors from a superclass through inheritance. The subclass extends the superclass, gaining its features while adding its own specialized behavior. It is not nested within, nor does the superclass inherit from the subclass.

Object-Oriented Programming (OOP) encompasses all the concepts listed: objects, classes, inheritance, encapsulation, polymorphism, abstraction, methods, reusability, message passing, and dynamic binding. These are all fundamental pillars of OOP methodology, making 'All above' the correct answer.

Shared Objects in Flash are objects created by SWF files that can store data locally on the user's system (similar to cookies). They persist between sessions and allow data to be saved and retrieved. They are not library sharing mechanisms, class-to-class sharing, or property-sharing objects.

In Java, all non-static and non-private methods are virtual by default and resolved via dynamic dispatch, meaning they can be overridden. Applying the final keyword prevents overriding and renders them non-virtual.

Instance variables are not overridden - they are hidden. When a subclass declares a variable with the same name, it shadows the parent's variable rather than overriding it. Only methods are truly overridden in polymorphism.