A simplex matrix is given. In this case, the solution is complete, so identify the maximum value offand 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 off 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.
Answer: D
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