Explanation:

The question asks for the definition of a 'backup', a fundamental practice in data management and security. Option (b) Copy to save a data from original source to other destination: This statement provides the most accurate and complete definition of a backup. A 'backup' is the process of making copies of data (from an 'original source') so that these additional copies may be used to restore the original after a data loss event (e.g., hardware failure, accidental deletion, cyberattack). The copies are typically stored in a 'different destination' (e.g., an external hard drive, cloud storage, network drive, tape drive) to ensure redundancy and availability. The primary goal is data recovery and business continuity. Therefore, this option perfectly encapsulates the purpose and method of a backup. Option (a) Connect his network to more component: This statement describes network expansion or adding more devices to a network. It has no relation to data backup. Connecting more components to a network might increase data access or sharing capabilities, but it does not inherently involve making copies of data for recovery purposes. Therefore, this option is incorrect. Option (c) Filter an old data from new data: This statement describes a data management or data analysis process where specific criteria are used to separate or select data based on its age or other characteristics. It is related to data organization or querying, not the creation of redundant copies for disaster recovery. While data filtering might be part of a larger data management strategy, it is not the definition of a backup. Therefore, this option is incorrect. Option (d) Access data from tape: 'Tape' is a specific type of storage medium commonly used for backups, especially for large volumes of data and long-term archiving. While accessing data *from* tape might be part of a data restoration process (which follows a backup), this statement only describes an action related to a backup medium, not the definition of 'backup' itself. The act of backing up is making the copy, not just retrieving it from a specific medium. Therefore, this option is too narrow and does not define the entire concept of backup. Option (e) None of these: This option would be correct only if none of the other options accurately defined a backup. However, option (b) provides a precise and widely accepted definition of data backup. Therefore, a correct answer is present, making 'none of these' incorrect.