(Diagram and explanation below)
A must be true, from the diagram. N is always in 1989.
B could be true. P can be hired anytime between 90-92
C could be true. P can be hired anytime between 90-92
D must be true, from the diagram. S is always hired in 1992.
E must be false. T can’t be hired in 1994 because T and M share a specialty. E is CORRECT.
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