Final answer:
Authentication must precede authorization as it verifies the user's identity, followed by authorization which grants permissions based on that identity.
Step-by-step explanation:
In the context of security protocols, the correct sequence is critical in ensuring proper access control. Authentication should take place first. This is the process where the system verifies who you are, often by requiring you to enter a username and a password. Only after authentication has confirmed your identity does authorization occur, which determines what resources and actions you are permitted to access or perform based on your identity. This sequence ensures that resources are protected from unauthorized access.