The correct answer is "Making at least one member function as pure virtual function".

In C++, an abstract class is a class that has at least one pure virtual function. A pure virtual function is a function that must be overridden in any derived class. It is declared by assigning 0 in its declaration. Here is an example:

```cpp
class AbstractClass {
virtual void pureVirtualFunction() = 0; // Pure virtual function makes this class Abstract class
};
```

The other options are incorrect. You cannot declare a class as abstract using the `virtual` or `static` keyword. Also, simply making at least one member function as a virtual function does not make a class abstract. A class with a virtual function is known as a base class.

Question

The correct answer is "Making at least one member function as pure virtual function".

In C++, an abstract class is a class that has at least one pure virtual function. A pure virtual function is a function that must be overridden in any derived class. It is declared by assigning 0 in its declaration. Here is an example:

```cpp
class AbstractClass {
    virtual void pureVirtualFunction() = 0;  // Pure virtual function makes this class Abstract class
};
```

The other options are incorrect. You cannot declare a class as abstract using the `virtual` or `static` keyword. Also, simply making at least one member function as a virtual function does not make a class abstract. A class with a virtual function is known as a base class.

Knowee AI · Accepted Answer

The correct answer is "Making at least one member function as pure virtual function".

In C++, an abstract class is a class that has at least one pure virtual function. A pure virtual function is a function that must be overridden in any derived class. It is declared by assigning 0 in its declaration. Here is an example:

```cpp
class AbstractClass {
    virtual void pureVirtualFunction() = 0;  // Pure virtual function makes this class Abstract class
};
```

The other options are incorrect. You cannot declare a class as abstract using the `virtual` or `static` keyword. Also, simply making at least one member function as a virtual function does not make a class abstract. A class with a virtual function is known as a base class.

Select the correct answerWhich of the following is used to make an Abstract class?OptionsMaking atleast one member function as pure virtual functionDeclaring as Abstract class using virtual keywordDeclaring as Abstract class using static keywordMaking atleast one member function as virtual function

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