Select from the dropdown lists to complete the text.
1. ( Sensomotorisches Stadium, Präoperationales Stadium, Konkret-operationales Stadium, Stadium der formalen Operation )
2. ( Präoperationales Stadium, Sensomotorisches Stadium, Konkret-operationales Stadium, Stadium der formalen Operation )
3. ( Konkret-operationales Stadium, Sensomotorisches Stadium, Präoperationales Stadium, Stadium der formalen Operation )
4. ( Stadium der formalen Operation, Sensomotorisches Stadium, Präoperationales Stadium, Konkret-operationales Stadium )