FIFO replacement b. LRU replacement c. Optimal Mention the merits and demerits of each of the above algorithms. 

FIFO Replacement Algorithm (First-In, First-Out)

Merits:

1. Simplicity: FIFO is straightforward to implement as it operates on the principle of replacing the oldest page in memory. The required data structure is usually a queue, which is easy to maintain.
2. Low Overhead: Since it only needs to track the order of pages as they are brought into memory, FIFO has minimal computational and memory overhead.
3. Predictability: The behavior of FIFO is predictable, which can simplify analysis and debugging.

Demerits:

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