Which two string types are considered fixed?

The correct options for identifying fixed string types are indeed String and W_String.

Fixed string types have a set length that does not change regardless of the actual content of the string. The String data type is designed to handle plain text and is characterized by its fixed size, typically determined when the string is created. Similarly, W_String operates under the same principle but is specifically geared towards handling wide characters, allowing for a broader range of characters, particularly useful for languages that require more than the standard ASCII character set.

In contrast, other types such as V_String and V_WString (variable-length string types) do not have a fixed size. These types can accommodate strings of varying lengths, which allows for more flexibility when dealing with unpredictable data lengths but also introduces some performance considerations due to the additional metadata required to manage the variable-length strings.

Understanding this distinction between fixed and variable-length string types is crucial when selecting the appropriate data type for various use cases in data processing and analysis.