Which one of the following describes correctly the homologous

1. Organs appearing only in embryonic stage and disappearing later in the adult
2. Organs with anatomical similarities, but performing different functions
3. Organs with anatomical dissimilarities, but performing same function
4. Organs that have no function now, but had an important function in ancestors

Those organs which have a common origin and are built on the same anatomical pattern, but perform different functions and are modified accordingly.