__________are a combination of a server-side cookie and a client-side cookieSelect one:a.Sessionsb.Cookiesc.$Sessionsd.$_Sessions

Answer

The correct answer is: a. Sessions

Explanation

1. Definition of Sessions: Sessions are used to store data on the server side in conjunction with client-side cookies. They allow for the persistence of user data across multiple requests without exposing sensitive information directly to the client.

2. Difference from Cookies: While cookies store data directly on the client side, sessions keep data on the server, identified by a unique session ID usually stored in a cookie.

3. Other Options:

   • b. Cookies: This option only refers to client-side storage.
   • c. $Sessions: This appears to be a syntactical representation possibly of a variable in programming, but is not a standard term.
   • d. $_Sessions: Similar to the previous option, this seems to refer to a variable but does not indicate a standard concept.

In summary, "Sessions" accurately describes the combination of server-side storage with a client-side cookie mechanism.