Question: What is a security context?

1. The security context includes details of the principal currently using the app, which is stored by default in a `ThreadLocal` in an `Authentication` object.
2. The security context holds a list of all users and their encrypted passwords in memory and a list of resources that users are able to access.
3. The security context includes information about safe network IDs and IP addresses that are able to access the system.
4. The security context includes information about permissions on the local file system describing how local file resources can be accessed.

Answer: The correct answer of the above question is Option A:The security context includes details of the principal currently using the app, which is stored by default in a `ThreadLocal` in an `Authentication` object.