Max $5$x$1+2$x$2$

s$.$t $7$x$1+4$x$2<=28$

$1$x$1+2$x$2<=10$

$4$x$1+5$x$2=20$

x$1,$ X$2>=0$

In Problem $1,$ the optimal solution of this linear programming model is

Group of answer choices

A$.(4,0)$

B$.(0,4)$

C$.(8/5.21/5)$

D$.(60/19.28/19)$

E$.(3,2)$