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 of 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 160 when
,
And
)
B) The maximum value of f is 160 when
,
And
)
C) The maximum value of f is 160 when
,
And
)
D) The maximum value of f is 160 when
,
) Since multiple solutions are possible, pivot on 1 in R₄C​_4.
E) The maximum value of f is 160 when
,
) Since multiple solutions are possible, pivot on 2 in R₃C₅​.