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Which of the following is NOT considered a cyberplanning tool for coordinating and carrying out an agenda?

A) VoIP B) Mail C) Internet D) E-mail

Create an ER diagram for each of the following descriptions:

(a) Each company operates four departments, and each department belongs to one company. (Note when the exact cardinality is known (in this example, 4) a value can replace the multiplicity range. (b) Each department in part (a) employs one or more employees, and each employee works for one department. (c) Each of the employees in part (b) may or may not have one or more dependants, and each dependant belongs to one employee. (d) Each employee in part (c) may or may not have an employment history. (e) Represent all the ER diagrams described in (a), (b), (c), and (d) as a single ER diagram.