Question 13
An e-commerce web application stores user shopping cart information as server-side session state. Each active user session occupies an average of 4 KB of memory. During a flash sale, the application is expected to handle 1.5 million concurrent active sessions, all stored in a centralized Redis cache server. What is the minimum RAM capacity (in GB) required solely to store these session states? (Assume that 1000B=1KB, 1000KB=1MB and so on)