To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) Resources to become unavailable to legitimate users - This option is correct. A race condition in a web server can occur when multiple processes or threads access shared resources simultaneously and interfere with each other's operations. This interference can lead to resources becoming unavailable to legitimate users, causing performance issues or even denial of service.
Option B) Cross Site Tracing - This option is incorrect. Cross-Site Tracing (XST) is a web security vulnerability that allows attackers to trick a victim's browser into making unauthorized requests on behalf of the victim. It is not directly related to race conditions in web servers.
Option C) Server Instability - This option is correct. A race condition in a web server can lead to server instability. When multiple processes or threads compete for shared resources, they can interfere with each other's operations, potentially causing crashes, freezes, or unpredictable behavior in the server.
Option D) Both A and B - This option is incorrect. While option A is correct, option B is incorrect. Therefore, the correct answer is option C.