Final answer:
The primary use case of S3 Byte-Range Fetches is to optimize data retrieval by allowing the partial download of an S3 object, which is useful for large files, interrupted downloads, or streaming content.
Step-by-step explanation:
The primary use cases of S3 Byte-Range Fetches are C) Optimizing data retrieval. This feature allows users to retrieve a specific subset of data from an S3 object, which can be particularly useful when dealing with large files. Instead of downloading the entire object, a byte-range fetch retrieves just a portion of the data. This can speed up the process considerably, especially when bandwidth is limited or when you only need a part of an object, such as a single image from a large archive or a specific scene from a video file.
By using byte-range fetches, applications can perform actions like resuming interrupted downloads, streaming video or audio content, and processing large datasets more efficiently. However, it's important to keep in mind that this function does not enhance encryption, expand storage, or directly improve durability, although it can indirectly contribute to system efficiency and performance.