Explanation:
The Multi Level Feedback Queue (MLFQ) processor scheduling algorithm is a popular scheduling algorithm used in operating systems. It is designed to handle processes with different priorities and dynamically adjust the priority of processes based on their behavior and resource requirements. However, the statement that is not true for the MLFQ algorithm is option 'C', which states that processes are permanently assigned to a queue.

Queues have different priorities:
In the MLFQ algorithm, processes are divided into several queues, each with a different priority level. The queues are ordered based on their priority, with the highest priority at the top and the lowest priority at the bottom. This allows the scheduler to give preference to processes with higher priority, ensuring that important and time-sensitive tasks are executed promptly.

Each queue may have different scheduling algorithm:
Each queue in the MLFQ algorithm may have a different scheduling algorithm associated with it. This allows the scheduler to choose the most appropriate scheduling algorithm for each queue based on the characteristics of the processes in that queue. For example, a queue with real-time processes may use a Round Robin scheduling algorithm, while a queue with interactive processes may use a Shortest Job Next scheduling algorithm.

Processes are permanently assigned to a queue:
This statement is not true for the MLFQ algorithm. In fact, one of the key features of the MLFQ algorithm is that it allows processes to move between queues dynamically. The scheduler monitors the behavior of each process and adjusts its priority level accordingly. If a process requires a lot of CPU time or exhibits a bursty behavior, its priority may be decreased, causing it to move to a lower-priority queue. Similarly, if a process is I/O bound or exhibits good interactive behavior, its priority may be increased, causing it to move to a higher-priority queue. This dynamic movement of processes between queues allows the MLFQ algorithm to adapt to the changing resource requirements and behaviors of processes.

This algorithm can be configured to match a specific system under design:
This statement is true for the MLFQ algorithm. The MLFQ algorithm can be configured and customized to match the specific requirements and characteristics of a system. The number of queues, the scheduling algorithms used for each queue, and the criteria for adjusting the priorities of processes can all be tailored to the specific system under design. This flexibility makes the MLFQ algorithm suitable for a wide range of systems with varying resource requirements and workload characteristics.