Question $19$

$2$ pts

The constraints $y_i=0$ or $1,$ for all $i=1,2,3,$ in the model means

the values of $x_{ij},$ for $i=1,2,3$ and $j=1,2,3,4,$ must be integers.

the values of $V_i,$ for $i=1,2,3,$ must be positive.

the value of each $V_i,$ for $i=1,2,3,$ in the final solution must be $0$ or $1.$

it will be sufficient if each $y_i,$ for $i=1,2,3,$ is nonnegative.

none of the above.