In a new machine$-$to$-$job assignment problem Machine Assignment.xlsx$,$ the current capacities of the machines are $1,2,1,2,$ and $1.$ If you could increase one of these capacities by $1,$ which would you increase $($in order to largely decrease the optimal total time$)?($hint: since there are only $5$ machines, it is easy to try it one by one$).$

Group of answer choices

Machine $5$

Machine $1$

Machine $2$

Machine $3$

It doesn't do any good to increase any of the capacities

Machine $4$