Final answer:
D. API is the technology that ensures a cluster of servers can handle incoming requests without having to track individual conversations.
Step-by-step explanation:
The technology that ensures a cluster of servers can handle incoming requests without having to track individual conversations is API (Application Programming Interface).
An API allows different software systems to communicate and interact with each other. It provides a set of rules and protocols that allow servers to receive and respond to requests from clients without needing to maintain information about past conversations.
With APIs, servers can handle concurrent requests from multiple clients simultaneously, making it efficient and scalable for a cluster of servers to handle incoming requests.