Which of the following best describes the 'Chomsky Hierarchy' in the context of formal grammars used in Computational Linguistics?

1. ক
   A classification of formal languages based on their generative power
   
2. খ
   A method for calculating semantic similarity between word vectors
   
3. গ
   A technique for morphological analysis using finite-state transducers
   
4. ঘ
   A framework for parsing dependency structures in natural language