The correct answer is: C. Compilation Error
The code has a compilation error because the property Bonus is declared as ReadOnly, but the Set method is still defined. A ReadOnly property cannot have a Set method.
A ReadOnly property is a property that cannot be set after it has been created. This is useful for properties that represent read-only data, such as the current date or time. To declare a ReadOnly property, you use the ReadOnly keyword in the Property statement.
The Set method is a method that is used to set the value of a property. The Set method must have the following signature:
Set(ByVal value As Type)
where Type is the type of the property.
In the code above, the property Bonus is declared as ReadOnly, but the Set method is still defined. This is a compilation error because a ReadOnly property cannot have a Set method.
To fix the error, you can either remove the Set method or declare the property as not ReadOnly.