please solve part B only :) thank you

1. Consider the following LP model: maximize : 2.1-2:19 + 513 subject to 2 +29 20 2: +33 - 5 22 +03 10 21,12,13 2 0 Part a. Find the optimal solution using the Big M method. What are the basic variables in the final optimal solution? What are the values of the non-basic variables in the final optimal solution? You should include detailed steps of your work in your answer). Part b. Find the optimal solution using the Two-phase method. What are the basic variables in the final optimal solution? What are the values of the non-basic variables in the final optimal solution? (You should include detailed steps of your work in your answer). Part c. Formulate the model in GAMS and find the optimal solution. What is the obtained objective function value when you run your GAMS code? Compare the optimal objective function value which you find in GAMS with the optimal objective function values that you calculated in Parts a and b. (You should include your GAMS code in your answer)