Which file access mode is appropriate when writing files for output datasets using Foundry’s FileSystem?

When writing files for output datasets using Foundry’s FileSystem, the appropriate file access mode is 'wb'. This mode stands for "write binary," which is essential when dealing with datasets that include binary data or require a specific file structure that cannot be represented accurately in a text format.

Using 'wb' allows the program to handle binary data correctly, ensuring that no data is altered during the writing process. This is critical in data engineering, where the integrity of datasets must be maintained throughout their lifecycle, especially when preserving the original formatting of files such as images, audio files, or any structured binary formats.

The option 'w' allows for writing text files but does not handle binary data correctly, which can lead to issues if the data being written is not textual in nature. Similarly, 'r' and 'rb' are modes used for reading files, which would not be appropriate when the task is to write output datasets. Therefore, using 'wb' is the correct choice, as it aligns with the technical requirements for writing output datasets effectively in binary format.