To solve this question, the user needs to know what information is appropriate to store in a cookie.

Now, let's go through each option and explain why it is right or wrong:

A. Session ID: This option is appropriate to store in a cookie. A session ID is a unique identifier assigned to a user's session and is used to keep track of session state. Storing the session ID in a cookie allows the server to identify the user's session on subsequent requests.

B. Account Privileges: This option is not appropriate to store in a cookie. Storing account privileges in a cookie is a security risk because cookies can be easily intercepted and manipulated. Instead, account privileges should be stored on the server and checked on each request.

C. UserName: This option is appropriate to store in a cookie. Storing the username in a cookie can improve the user experience by allowing the website to remember the user's preferences and customize the user's experience.

D. Password: This option is not appropriate to store in a cookie. Storing passwords in cookies is a significant security risk because cookies can be easily intercepted and manipulated. Passwords should never be stored in cookies or any other client-side storage.

The Answer is: A and C