A credentialed scan is the appropriate choice when dealing with fragile systems. This method uses valid access credentials to perform a more in-depth and safer examination of the target systems, reducing the risk of causing disruptions which may occur with more aggressive uncredentialed scans that can overwhelm sensitive systems. A non-credentialed scan can risk causing issues with fragile systems due to the more intrusive nature of the probing. A stealth scan's main purpose is to avoid detection, and while it can be less noisy on the network, it might still cause a fragile system to become unstable. Transmission Control Protocol (TCP) connect scans are more intrusive as they establish a full TCP connection, potentially leading to system instability.