Which of the following best describes the difference in the meaning of the following two ER diagrams? In (i), every researcher must work on a project and we know exactly how much time each spends on that project. In (ii) every researcher works on a project, but we only know the total time for the project. In (i) every project must have some researchers and we know exactly how much time each researcher spends on each project they work on. In (ii) every project has some researchers working on it, but we only know the total time for the project. In (i) every researcher works on one project and we know exactly how much time each researcher spends on the project they work on. In (ii) every researcher works on at least one project, and we know the total time they spend working on all of their projects. In (i) every project must have some researchers and we know exactly how much time each researcher spends on each project they work on. In (ii) every project has some researchers working on it, and we know the total time each researcher spends working on all of their projects. None of the above answers is correct