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You are developing a Snowpark Python UDF to perform sentiment analysis on product reviews. The UDF takes a text review (STRING) as input and returns a sentiment score (FLOAT). You want to operationalize this UDF, ensuring type safety and performance. Which of the following approaches is MOST recommended, considering both ease of use and explicit type declaration?
Correct Answer: C
Using a combination of type hints and the registration API provides the best balance of readability and explicit type safety. The @udf decorator with 'return_type' and ensures that Snowflake understands the data types, while the Python type hints improve code readability and help catch type errors during development. Option A relies on inference, which can be less explicit and potentially lead to unexpected behavior. Option B lacks the readability of Python type hints. Option D is not a valid way to register a UDF. Casting the result (Option E) doesn't define the data type beforehand and is less efficient than defining during registration.