Which of the following best describes the 'Compositionality Principle' in semantics?

1. ক
   The meaning of a complex expression is determined by its parts and their mode of combination.
   
2. খ
   Words have meanings only in relation to other words in the lexicon.
   
3. গ
   Context is the primary determinant of a sentence's truth value.
   
4. ঘ
   Grammatical structure is independent of semantic interpretation.