Answer:
opton c: fault tolerance uses redundant units to provide a system with the ability to continue functioning when part of the system fails
Step-by-step explanation:
Fault tolerance on a system is simply defined as a key feature that makes a computer system to continue with its operations even though there is a system failure on one part or a specific part of the system. A computer that is said to be fault tolerant system will operate well/ fine, after one of the power supplies fails,
A fault tolerant system is known to have no occurrence of Single point of failure, No single point repair takes the system down, fault isolation or identification and Fault containment, robustness or variability control