What is the primary purpose of the 'Viterbi Algorithm' in Hidden Markov Models (HMMs) for NLP?

1. ক
   To find the most likely sequence of hidden states
   
2. খ
   To calculate the probability of an observation sequence
   
3. গ
   To update the parameters of the model
   
4. ঘ
   To perform unsupervised clustering of words