3: Provides an example of when a race condition may occur AND outlines how secure code could prevent it. 2: Outlines some features of race conditions. 1: Some relevant information.

With multiple teachers potentially accessing the database at the same time, race conditions can allow malicious users to gain unauthorised access. Authentication could be used to restrict access to the database, and code can be written to use atomic transactions and database locks to time the reading and writing of data.