Ive used the following diagram to describe the behavioral relationships between entities, boundaries and controllers (EBC). (a) [6 pts.] Are Boundary objects allowed to directly interact with Entity objects? Explain why or explain why not. (b) [6 pts.] Bob the Intern believes he cant write JUnit test cases for Entity classes until the Boundary classes are complete. Do you agree with him? Explain why or explain why not. (c) [8 pts.] We used a specific approach to modeling controllers. The UML model describing the design of a Controller class has four specific features. Explain what they are.