\begin{tabular}{l}{$$ [C++11]: $$ To help prevent errors, apply $$ C++11 $$ 's } \ keyword to the prototype of every \ derived-class function that overrides a base- \ class virtual function. \ abstract \ None of the above. \ virtual \ override \ \hline\end{tabular}

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The question seems to be about the correct keyword to use in C++11 for functions in derived classes that override virtual functions from a base class.

In C++11, the `override` keyword is used to indicate that a function is intended to override a virtual function in a base class. This helps the compiler catch errors if the function does not actually override any base class function (for example, due to a mismatch in the function signature).

Let's analyze the options provided:

1. **abstract**: This is not a keyword in C++. In C++, you can create abstract classes by declaring at least one pure virtual function, but "abstract" itself is not a keyword.

2. **None of the above**: This option suggests that none of the provided keywords are correct, which is not the case since `override` is indeed a valid keyword.

3. **virtual**: This keyword is used in the base class to declare a function as virtual, allowing it to be overridden in derived classes. However, it is not used in the derived class to indicate overriding.

4. **override**: This is the correct keyword to use in the prototype of every derived-class function that overrides a base-class virtual function in C++11.

Therefore, the correct answer is **override**.
Use the `override` keyword in derived-class functions to indicate they override a base-class virtual function.

To help prevent errors, apply 's

keyword to the prototype of every

derived-class function that overrides a base-

class virtual function.

abstract

None of the above.

virtual

override

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To help prevent errors, apply 's keyword to the prototype of every derived-class function that overrides a base- class virtual function. abstract None of the above. virtual override