Which of the following statements is/are correct? a. At the network layer, entitlement can map identity and/or attributes to functionality. b. At the application layer, entitlement rules can define the protocols allowed to be used. c. At the system layer, identity, and attributes used as part of the entitlement rules can stop or restrict access, or may direct access to a particular interface, for example, a web interface rather than a full-GUI interface. d. At the process layer, entitlement can be used to define the processes or functions run within an application. Entitlement can also specify that enhanced functions require additional verification (which can prompt the user or run in the background).