Answer:
C. Redundancy.
Step-by-step explanation:
In an architecting resilient systems, redundancy can be simply understood as extra components which can used as back up when there are accidents and failures in the main components. It helps in the reliability and security of the systems.
As we know failures and crises may arise anytime in a system, architecting resilience depends on redundancy, which means that every component is backed up by an alternative in case it fails. Thus, helping the systems to recover from crisis and accidents.