Some systems act as intermediarles in the backup process to reduce the amount of data safeguarded. They stand between the data source and the backup system and process the data in chunks, sending only one copy of each chunk to be backed up$.$

How are these systems known as$?$

a$.$ Tape Archives

b$.$ Backup Robotics

c$.$ Target Deduplication Appliances

d$.$ Backup Bridge Appliances

Clear my choice