John visits an online shop that stores the IDs and prices of the items to buy in a cookie. After selecting the items that he wants to buy, the attacker changes the price of the item to 1. Original…

Computer-based social engineering involves deceiving users through digital means such as phishing, not directly manipulating data structures like cookies.

A man-in-the-middle attack requires intercepting traffic between two parties in transit; John is modifying his own local cookie, not intercepting communication between others.

Cross-site scripting involves injecting malicious scripts into web pages viewed by other users, not altering cookie values to manipulate server-side pricing logic.

Cookie poisoning involves modifying cookie data on the client side to manipulate application logic on the server. By changing ItemPrice1 and ItemPrice2 to 1, John causes the server to calculate a falsely low total price, exploiting the application's trust in unvalidated cookie data.