The correct answer is: B. Public, Private
Objects are represented by public variables and private properties. Public variables are accessible to all code in the program, while private properties are only accessible to the code in the class that defines them. This allows for greater control over the data in an object and makes it more difficult for other code to accidentally or intentionally modify it.
Public variables are declared using the public keyword, while private properties are declared using the private keyword. For example, the following code defines a class with a public variable and a private property:
class MyClass {
public int x;
private int y;
}
The x variable can be accessed from any code in the program, while the y property can only be accessed from code in the MyClass class.
There are several reasons why it is often useful to use private properties. First, it can help to prevent accidental changes to data. If a property is private, then only code in the class that defines it can modify it. This can help to avoid errors caused by code accidentally modifying the wrong data.
Second, using private properties can make it more difficult for other code to intentionally modify data. If a property is private, then other code cannot access it directly. This can make it more difficult for malicious code to modify the data in an object.
Finally, using private properties can make code more modular. If a property is private, then it can be changed without affecting other code in the program. This can make it easier to maintain and update code.