Final answer:
Clustered systems utilize parallel processing, improve performance and availability, and add redundancy. Option C is correct.
Step-by-step explanation:
The types of systems that utilize parallel processing to improve performance and availability and add redundancy are clustered systems.
A clustered system is a group of interconnected computers that work together as a single system. In a clustered system, tasks are distributed across multiple computers, allowing them to be executed simultaneously, which improves performance. Additionally, redundancy is achieved by replicating data across the cluster, ensuring that if one computer fails, another can take over without interrupting the system.
For example, a web server cluster can handle a large number of requests simultaneously and provide continuous availability even if one of the servers fails.
The manager of a department store is conducting a survey to measure employee satisfaction by selecting four departments at random and then interviewing every employee in those departments. This type of survey design is known as Cluster sampling. In cluster sampling, the entire population is divided into groups, or clusters, and a random sample of these clusters is chosen.
All individuals within the chosen clusters are surveyed. This method is often used when it is difficult or costly to conduct a survey with every individual in the population, but the researcher still requires a sample that is representative of the entire population.