What AI engines does ModelArts support? (Multiple choice)

Which of the following is the abbreviation of speech synthesis?

Syntactic analysis generally uses a syntax tree to represent the analysis results.

The Gaussian model uses the Gaussian density function to accurately quantify things and decomposes one thing into several models based on Bernoulli distribution.

Natural language understanding and analysis is a hierarchical process. Please sort the natural language understanding levels in progressive order.
The order from low to high should be (fill in the serial number) 1) lexical analysis, 2) semantic analysis, 3) pragmatic analysis, 4) phonetic analysis, 5) syntactic analysis