______ represent a task of user and structure of goal.Select one:a.Linguistic modelsb.Physical and device modelsc.Hierarchical modelsd.None of the mentioned

To determine the correct answer to the question, let's analyze the options provided:

1. Linguistic models: These models are generally centered around the understanding and processing of language, and they do not specifically represent tasks or goals related to user tasks.

2. Physical and device models: These models focus on the physical aspects of devices and their interaction with users, rather than the structure of user tasks and goals.

3. Hierarchical models: Hierarchical models organize tasks or goals in a structured manner, often visualized in a tree-like format. They effectively represent user tasks and their goals.

4. None of the mentioned: This option suggests that none of the provided choices are suitable, but based on the analysis, this is not true.

Final Answer

c. Hierarchical models represent a task of the user and the structure of the goal.