Excessive volume in terms of either users or data,examples might include a denial of service (DoS) attack or a situation where a widely viewed news item prompts a large number of users to visit a Web site during a three-minute period This comes under which type of testing?

Stress testing tests systems under extreme or excessive loads beyond normal operating conditions. The scenario describes excessive volume - either DoS attacks or sudden massive traffic surges (widely viewed news item causing traffic spikes). These are extreme conditions beyond normal expected load. Load testing tests under expected loads, performance testing measures speed, and recovery testing tests crash recovery. Stress testing is specifically designed for these excessive overload scenarios.