Tiny college wants to keep track of the history of all its administrative appointments, including dates of appointment and dates of termination. (hint: time-variant data is at work.) the tiny college chancellor may want to know how many deans worked in the college of business between january 1, 1960, and january 1, 2018, or who the dean of the college of education was in 1990. given that information, create the complete erd that contains all primary keys, foreign keys, and main attributes.