To answer this question, we need to understand what a race condition is and how it can affect a web server.
A race condition occurs when two or more processes or threads access shared data or resources simultaneously, and the final outcome of the execution depends on the order in which these processes or threads are scheduled. In the context of a web server, a race condition can occur when multiple requests are being processed concurrently.
Now let's go through each option:
Option A) Resources becoming unavailable to legitimate users - This option is correct. In a race condition, if multiple requests are accessing and modifying the same resources or data simultaneously, it can lead to inconsistencies or corruption of the shared resources. This can result in resources becoming unavailable or inaccessible to legitimate users.
Option B) Cross-Site Tracing - This option is incorrect. Cross-Site Tracing (XST) is a security vulnerability that allows an attacker to trick a user's browser into making an unintended request to a different domain. It is not directly related to race conditions in web servers.
Option C) Server Instability - This option is correct. Race conditions can lead to unpredictable and unstable behavior of a web server. If multiple requests are modifying shared resources concurrently, it can cause conflicts and inconsistencies in the server's state, leading to server instability.
Option D) Both A and B - This option is incorrect. The correct answer is option C, as race conditions can cause server instability, but they are not directly related to Cross-Site Tracing.
Therefore, the correct answer is option C. A race condition in a web server can cause server instability.