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    Question

    Which of the following best explains segmentation in

    memory management?
    A Dividing memory into fixed-size blocks for allocation. Correct Answer Incorrect Answer
    B Partitioning memory into variable-sized units based on logical divisions Correct Answer Incorrect Answer
    C Creating a hierarchical memory structure for efficient storage. Correct Answer Incorrect Answer
    D Segmenting physical memory into equal units for uniform access Correct Answer Incorrect Answer
    E Mapping physical memory addresses to virtual memory addresses. Correct Answer Incorrect Answer

    Solution

    Segmentation is a memory management technique where memory is divided into variable-sized units called segments. Each segment corresponds to a logical division of a program, such as functions, arrays, or global variables. Key characteristics of segmentation include:

    • Logical Grouping : Each segment represents a logical unit, allowing for better organization and modularity.
    • Variable Size : Unlike paging, segments are not of fixed size, enabling efficient use of memory for programs with diverse requirements.
    • Segmentation Faults : Accessing memory outside a segment's defined boundaries results in a fault, ensuring memory safety.
    For example, a program might be divided into segments for code, stack, and heap. The operating system uses segment tables to map these logical segments to physical memory locations. This improves program modularity and supports features like dynamic memory allocation. Explanation of Incorrect Options: A) Dividing memory into fixed-size blocks for allocation : This describes paging , a different memory management technique, where memory is split into fixed-size units. C) Creating a hierarchical memory structure for efficient storage : Hierarchical memory structures are associated with caching or tiered storage systems, not segmentation. D) Segmenting physical memory into equal units for uniform access : Segmentation does not mandate equal-sized units; segments vary in size based on program needs. E) Mapping physical memory addresses to virtual memory addresses : This describes the general concept of virtual memory , which can involve paging or segmentation but does not define segmentation itself.

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