If we wish to mount a directory with Read Only option, which of the following is correct
    mount -t ext4 -o noexect,ro /path/to-dir /mnt/folder
mount ext4 -no-read-only /path/to-dir /mnt/folder
mount -t ext4 -o noexect,ro /mnt/folder /path/to-dir
mount ext4 -no-read-only /mnt/folder /path/to-dir
mount ext4 noexect,ro /path/to-dir /mnt/folder
 
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