Solve the linear programming problem using the simplex method.
Maximize
z=2x1+5x2
subject to
5x1+x2<=60 5x1+2x2<=80
x1+x2<=70 x1,x2=0
Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The maximum is z= when x1=,x2=,s1=,s2=, and s3=