choose the answer and provide a short explanation

1. The........... method could be used to distribute salesmen among different territories. 1- Hungarian 2- CPM 3- maximal flow 4- VAM 5- least cost 6- none of the above

2. Among the phases of the Operations Research (OR) process, model construction is the phase 1- in which the problem is completely understood 2- in which iterative algorithms are used to solve the problem 3- in which simulation is used to imitate the behavior of the problem 4- which verifies whether the model accurately describes the problem or not 5- which translates the problem into mathematical expressions 6- all of the above

3. Using the M method, if any artificial variable has original problem has no optimal solution. 1- zero 2- non-zero value in the final tableau, the 3- positive 4- non-positive 5- negative 6- non-negative

4. When using the simplex method to solve a standard minimization problem, the optimal solution is reached when....... 1- all decision variables become basic ones 2- values of all variables in the objective function row become non-negative 3- values of all variables in the objective function row become non-positive 4- values of all variables in the objective function row become zero 5- the number of iterations exceeds the number of decision variables 6- none of the above

5. Linear Programming is 1- the most widely used Operations Research (OR) modeling technique 2- the technique for optimizing linear objective function, subject to linear constraints 3- often solved using the simplex method and its derivatives 4- already used to solve many real-life optimization problems 5- all of the above 6- none of the above