Discuss how the security scheme in Linux allows a high level of security even without network security. Moreover, it can serve files on a need-to-know basis and protect sensitive data such as home directories and system configuration files.

The best definition of an idiom is a. a word or phrase that describes a noun b. a word or phrase describing a verb c. a phrase containing figurative language in which the word expresses a different idea from its exact meaning d. a phrase that compares two unlike objects or ideas