The command chmod 751 F1.DAT is to set the permission to file F1.DAT so that

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Starting with the given command, chmod 751 F1.DAT, we need to translate the numeric mode 751 into read/write/execute permissions for owner, group, and others.
Option A: 'all users can execute it' is true here because the numeric mode 751 grants execute permission to owner (1st digit 7 includes read, write, and execute), to the group (2nd digit 5 includes read and execute), and to others (3rd digit 1 includes execute only). Therefore, every category of user can execute the file, which makes this statement correct.
Option B: 'nobody can delete it.' Deletion of a file is governed by directory permissions, not the file's own permission bits. Even if you cannot delete a file directly, a user could remove it if they have permission on the directory (e.g., write/delete in the directory). Thus this claim is not determined by the file’s mode alone and is misleading.
Option C: 'any user can have full access (read, write, execute) to it' is inaccurate because the mode 751 does not grant read and write to all users. While owner has full access (7), and group has read and execute (5), others have only execute (1). There is no scenario in which every user has full (read/write/execute) access.
Option D: 'no one can access to it except the owner' is incorrect since others do have execute access under mode 751 (as explained above). Therefore, this statement contradicts the actual permissions encoded in 751.

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The command chmod 751 F1.DAT is to set the permission to file F1.DAT so that

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