A Simplex Matrix Is Given

A simplex matrix is given. In this case, the solution is complete, so identify the maximum value of f and a set of values for the variables that gives this maximum value. If multiple solutions may exist, indicate this and locate the next pivot.

A) The maximum value of f is 80 when
,
And
)
B) The maximum value of f is 80 when
,
And
)
C) The maximum value of f is 80 when
,
) Since multiple solutions are possible, pivot on 2 in R₁C₃.
D) The maximum value of f is 80 when
,
) Since multiple solutions are possible, pivot on 1 in R₁C₄.
E) The maximum value of f is 80 when
,
) Since multiple solutions are possible, pivot on 1 in R₂C₄.