Question: Both 1,2,3,&4 checked and only 1,2,&3 checked are incorrect. In addition to actual files on the filesystem, these things may be represented as file descriptors:
Both 1,2,3,&4 checked and only 1,2,&3 checked are incorrect.

In addition to actual files on the filesystem, these things may be represented as file descriptors: Network connections (sockets) Memory mappings Hardware devices Kernel services
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