To answer this question, you need to understand the client-side techniques specific to ASP.NET. Let's go through each option to understand why it is correct or incorrect:
Option A) Cookies - Cookies are a client-side technique that can be used in any web development framework, not just ASP.NET. Therefore, this option is incorrect.
Option B) Query string - Like cookies, query strings are also a client-side technique that can be used in any web development framework. Therefore, this option is also incorrect.
Option C) View state - View state is a client-side technique that is specific to ASP.NET. It is used to store the state of the web controls on a page between postbacks. Therefore, this option is correct.
Option D) Both a and b - This option is incorrect because cookies and query strings are not specific to ASP.NET.
Option E) All of the above - This option is incorrect because cookies and query strings are not specific to ASP.NET.
The correct answer is C) View state. This option is correct because view state is a client-side technique that is specific to ASP.NET.