What is meant by data at rest ( dar)?

(a) a patch to the linux kernel and a set of administrative tools that attempt to enhance security.
(b) stored data.
(c) the data may be in archival form on tape or optical disc, on a hard disk, or sitting in a system’s buffers.
(d) access rights that are given to a user by the owner of an object.
(e) data as it travels from one place to another, such as over a network.