Final answer:
B) Write. Read and Write permission allows a shared file to be opened, viewed, modified, and deleted, with Write being the correct option enabling these actions.
Step-by-step explanation:
The correct answer to the question about shared file permissions is B) Write permission. Having read and write permissions allows a user to open, view, modify, and delete a shared file. Execute permission would allow a user to run a file if it's an executable, but does not inherently allow for modification or deletion. Modify permission typically includes write, but it's not a separate permission. Delete is a result of write permission, rather than a standalone permission.
Read and delete permission allows a shared file to be opened, viewed, modified, and deleted. This permission grants the ability to remove the file entirely.