Which command is used to assign only read permission to all three categories of the file 'note'?

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Question:Which command is used to assign only read permission to all three categories of the file 'note'?

1. chmod go+r note

2.chmod a-rw

3.chmod ugo=r note

4. chmod u+r,g+r,o-x note

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  1. Which command is used to assign only read permission to all three categories of the file 'note'?
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