If approximate solution of the set of equations, 2x+2y-z = 6, x+y+2z = 8 and -x+3y+2z = 4, is given by x = 2.8 y = 1 and z = 1.8. Then, what is the exact solution?

• A. x = 3 , y = 1 , z =2
• B. x = 1 , y = 2 , z =2
• C. x = 2 , y = 3 , z = 1
• D. x = 1 , y = 3 , z = 2