Which statement is true regarding cookie storage?

Cookies are stored locally on the client's device, which is the correct understanding of how cookie storage functions. When a web server creates a cookie, it is sent to the user's browser, where it gets stored on the client's device. This allows the browser to send the cookie back to the server with subsequent requests, helping maintain session information, user preferences, and other relevant data.

This process enables personalized experiences on websites, as the server can use the information in the cookies to recognize returning users. By being stored on the client's device, cookies can help improve performance by reducing the need for repeated data transmission between the server and the client.

On the other hand, other statements are incorrect because they either misrepresent where cookies are stored or their role in web applications. Cookies are not stored on the server; rather, they exist in the client's browser environment. They are indeed stored in browsers, which means options pointing to the contrary are inaccurate. While cookies can play a role in web security, they are not central to online security in general; security practices involve a broader array of mechanisms beyond just cookies.