Prepare a small write-up on at least five (5) different solvers that can be used to solve OR problems. Give a brief description of each solver and give the pros and cons of using each different type of solver. Make sure you include cost as a factor. Also discuss factors such as model size, the number of decision variables and the number of constraints, along with any other relevant factors. Imagine that you are working on a large OR problem for your job and you realize the default Excel solver is not sufficient.