The line: virtual double function $$ X() $$ const $$ =0 $$; in a class definition indicates that the class is probably a: Base class. Library class. Protected class. Derived class.

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1. The line  
   $$
   \texttt{virtual double function X() const = 0;}
   $$
   defines a pure virtual function.

2. A pure virtual function is declared by appending $$ = 0 $$ to the function declaration.

3. A class containing at least one pure virtual function is considered an abstract class, meaning it cannot be instantiated and is intended to serve as a base class for derived classes that provide concrete implementations for the pure virtual function.

4. Among the given options, the class is most likely a:  
   $$
   \textbf{Base class.}
   $$

Thus, the correct answer is **Base class**.
The class is most likely a **Base class**.

The line: virtual double function \( X() \) const \( =0 \); in a class definition indicates that the class is probably a: Base class. Library class. Protected class. Derived class.

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