Western Governors University (WGU) ICSC2100 C949 Data Structures and Algorithms I Practice Exam

The correct choice identifies that hash tables are indeed a common type of data structure. Hash tables are widely used because they provide an efficient way to store and retrieve data using a key-value mapping. This allows for near-constant time complexity on average for operations such as insertion, deletion, and lookup, making them very effective for scenarios where fast data access is needed.

On the other hand, arrays, graphs, and linked lists are all fundamental data structures that are widely recognized and utilized in computer science. Arrays offer a way to store elements in a contiguous block of memory, allowing for quick access via indices. Graphs represent relationships between data items through nodes and edges, providing crucial capabilities for various applications, particularly in networking and pathfinding. Linked lists offer a flexible way to handle dynamic sizes of data with ease of insertion and deletion at various positions, making them versatile in applications where list size can change frequently.

This illustrates how hash tables, arrays, graphs, and linked lists each have their unique characteristics and use cases within the realm of data structures.