Which of the following statements about the levels of natural language understanding are true?

Syntactic analysis is to find out the meaning of words, structural meaning, their combined meaning, so as to determine the true meaning or concept expressed by a language.

Semantic analysis is to analyze the structure of sentences and phrases to find out the relationship between words and phrases, as well as their functions in sentences.

Speech analysis involves distinguishing independent phonemes from a speech stream based on phoneme rules, and then identifying syllables and their lexemes or words according to the phoneme form rules.

Lexical analysis is to find the lexemes of a word and obtain linguistic information from them.

Pragmatic analysis is to study the influence of the language's external environment on the language users.