In a subclass sub1 you want to redefine a component of a superclass super. How do you achieve this?

To redefine a component of a superclass in a subclass, the appropriate approach is to implement the redefined component in the subclass. This allows you to override the behavior inherited from the superclass by providing a new implementation specific to the subclass.

When defining a class hierarchy, the subclass typically inherits properties and methods from the superclass. However, there are scenarios where you want to alter or extend the functionality of those inherited components. By implementing the redefined component directly in the subclass, you ensure that the subclass can provide its unique logic while retaining the original characteristics of the superclass if necessary. This adheres to the principles of object-oriented programming, specifically polymorphism, by allowing different implementations based on the object's actual class rather than its declared type.

The other options do not correctly describe the mechanism for redefining a component. For example, adding a clause in the superclass or attempting to redefine the component in the subclass using an incorrect syntax does not serve the purpose of proper redefinition. Such approaches may lead to confusion or compilation errors within the ABAP programming context.