Which of the following best describes the concept of redundancy in mission-critical systems?

Redundancy in mission-critical systems refers to the duplication of critical components to enhance reliability and ensure continuous operation even in the event of a failure. This concept is vital in environments where system uptime is crucial, such as in healthcare, finance, or emergency services. By having redundant components, such as additional servers, power supplies, or communication lines, the system can switch to these backup elements seamlessly if the primary component fails. This capability minimizes downtime and helps maintain service continuity, which is essential for mission-critical operations.

The other options touch on different aspects of system design but do not capture the essence of redundancy. Removing unnecessary components would typically enhance efficiency but does not relate to backup or reliability. Streamlining operations is about optimizing processes rather than ensuring duplicate systems are in place. Enhancing security protocols focuses on protecting systems from breaches, which, while important, does not relate directly to redundancy and backup systems.