A Backup Software Heavily Uses Hard Links Between Files Which

A backup software heavily uses hard links between files which have not been changed in between two backup runs. Which benefits are realized due to these hard links?

A) The old backups can be moved to slow backup media, such as tapes, while still serving as hard link target in new backups.
B) The backup runs faster because hard links are asynchronous operations, postponing the copy operation to a later point in time.
C) The backup is guaranteed to be uncharged because a hard linked file cannot be modified after its creation.
D) The backup consumes less space because the hard links point to the same data on disk instead of storing redundant copies.
E) The backup runs faster because, instead of copying the data of each file, hard links only change file system meta data.