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A graph is the most suitable data structure for representing and resolving task dependencies because it models relationships between tasks effectively. In task scheduling, dependencies between tasks can be represented as directed edges, with tasks as vertices. A Directed Acyclic Graph (DAG) is commonly used to depict dependencies where a task must be completed before another begins. For example, a node representing "Task A" can point to "Task B" if "Task A" is a prerequisite for "Task B." Algorithms like topological sorting can be applied to determine the order of execution. Graphs offer flexibility in representing both simple and complex dependency scenarios, which is not feasible with simpler data structures. Their ability to accommodate cycles (or ensure they are absent, as in DAGs) and maintain directed relationships makes them an ideal choice for task scheduling systems. Why Other Options are Incorrect: A) Binary Tree: Binary trees are hierarchical structures where each node has at most two children. While they are efficient for hierarchical data, they are unsuitable for task scheduling where dependencies may not follow a strict binary or hierarchical relationship. A task may depend on multiple others, which binary trees cannot represent. B) Stack: A stack follows a Last-In-First-Out (LIFO) order, making it useful for certain linear operations like backtracking. However, it cannot efficiently model task dependencies with multiple relationships or prerequisites, as it does not inherently represent directed connections between tasks. C) Queue: A queue operates in a First-In-First-Out (FIFO) manner, making it suitable for linear task execution. However, it lacks the capability to model complex relationships between tasks or resolve dependencies dynamically, as required in a task scheduling system. E) Linked List: Linked lists are sequential data structures used to store and traverse elements linearly. They cannot handle scenarios where tasks have multiple dependencies or require a directed and non-linear representation of relationships.
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