_________________ uses hard disk and optical or tape jukebox technology to offer continuous online backup functionality

A.
Disk duplexing

B.
Disk shadowing

C.
Hierarchical Storage Management

D.
Dual backbones

Explanation:
Hierarchical Storage Management uses hard disk and optical or tape
jukebox technology to offer continuous online backup functionality. Files are moved
along a hierarchy of storage devices to less-expensive forms of storage based on
rules tied to the frequency of data access.