To answer this question, we need to understand what an extent is in the context of a sequential file.
In a sequential file, data is stored in blocks or units called extents. An extent is a contiguous section of storage space on a storage volume. When a sequential file is created, it can be allocated multiple extents to store its data.
The correct answer is D) 16 extents on a volume for a sequential file. This means that a sequential file can have up to 16 extents allocated on a storage volume to store its data.