Which lvchange option is used to prevent allocation of physical extents to a logical volume?
-a n or --alloc none
-an or --activate no
-l +100%FREE
-r or --resizefs
The lvchange option '-a n' or '--alloc none' is used to change the allocation policy for a logical volume to 'none', preventing further extents from being allocated to the volume. This option would be used in advanced scenarios such as maintenance or to prevent changes to a volume while taking a snapshot. The other listed options do not relate to the allocation policy and serve different purposes within the lvchange command.
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