To improve performance when reading files, "block read ahead" can be performed. What is this? A. The operating system determines, when reading block K, if the file is being read sequentially. If it is, the file system will retrieve block K, and initiate the request for block K+1 in the file. B. The operating system determines, when writing block K, if the file is being written sequentially. If it is, the file system will retrieve block K, and initiate the request for block K+1 in the file. C. The operating system determines when reading block K if that block was accessed via a seek. If it is, the file system will retrieve block K, and initiate the request for the next block in the file that is needed by the process. D. All of the above

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