Which of the following best describes the 'Bag-of-Words' (BoW) model in computational linguistics?

1. ক
   A method that preserves word order and semantic relationships
   
2. খ
   A representation that ignores grammar and word order, focusing only on frequency
   
3. গ
   A deep learning architecture for sequence modeling
   
4. ঘ
   A technique for syntactic tree generation