$2-2.$ Determine the best feasible solution among the following $($feasible and infeasible$)$ solutions of the Reddy Mikks model:

a$.x_1=1,x_2=4.$

b$.x_1=2,x_2=2.$

c$.x_1=3,x_2=1\mathrm{.}5.$

d$.x_1=2,x_2=1.$

e$.x_1=2,x_2=-1.$