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(a) The problem is a minimisation problem and the z-row of the tableau was initialised with

the cost vector (c²).

(b) The problem is a maximisation problem and the z-row of the tableau was initialised with

the cost vector (c²).

(c) The problem is a minimisation problem and the z-row of the tableau was initialised with

the negative of the cost vector (-²).

(d) The problem is a maximisation problem and the z-row of the tableau was initialised with

the negative of the cost vector (-²).