Systems known as ___ are able to continue their operation even when problems are present.AinteroperableBuninterruptableCscalableDfault-tolerant

The correct answer is D. fault-tolerant.

Explanation:

Fault-tolerant systems are designed to continue operating correctly even in the presence of faults or errors. This means that when a part of the system fails or encounters a problem, the overall system can still function without interruption. Such systems incorporate redundancy, error detection, and recovery mechanisms to handle failures seamlessly.

In contrast, the other options provided do not accurately convey this capability:

• A. Interoperable refers to the ability of different systems or software to work together without any issues.
• B. Uninterruptable means that something cannot be interrupted or stopped, but does not imply continued operation in the presence of faults.
• C. Scalable indicates the ability of a system to handle increasing loads or to expand its capabilities, but it does not address the system's performance during faults.

Thus, the best choice among these options is D. fault-tolerant, as it distinctly describes a system's resilience to errors and continuous operation.