Which partition structure allows for extended partitions?

The partition structure that allows for extended partitions is the Master Boot Record (MBR). MBR is an older partitioning scheme that supports a maximum of four primary partitions. However, to overcome this limitation, it introduces the concept of an extended partition. An extended partition acts as a container for multiple logical partitions, allowing a system to effectively manage more than four partitions.

In MBR, the first four partitions can be either primary or extended, but only one of those can be marked as an extended partition. Within that extended partition, you can create multiple logical partitions, thereby providing greater flexibility in managing disk space.

Other partition structures like GPT (GUID Partition Table), while modern and capable of supporting a much larger number of partitions, do not use the concept of extended partitions. Dynamic disks and hybrid structures do not pertain to the concept of partition types like MBR and their handling of logical versus primary partitions. Therefore, MBR is the partition scheme that explicitly allows for the use of extended partitions through its structure.