You are tasked with optimizing a COBOL program that reads and processes a large sequential file. Which technique would you consider for reducing I/O operations and improving performance?

Adding additional indexes to the file
Implementing a buffer pool
Increasing the block size of the file
Using direct access instead of sequential access

Implementing a buffer pool involves buffering records in memory to reduce I/O operations when reading from or writing to the file. This can significantly improve performance by minimizing disk access and reducing overhead associated with disk I/O operations.

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