to add login security, which two pieces of code do you need?

Question:to add login security, which two pieces of code do you need?

1.1.all important data is a resource2. every resource has a proper name (URL)

2.:format (that period is a concatenation period)

3.the method within the controller to call

4. 1. login method (that checks a username and password) and 2. a filter (that calls the login method when needed)

Answer:4