Use this sensitivity report to answer the questions below. If the cost per hour to operate Mine was $$300$: Would $(1,3)$ remain optimal? What minimum Cost could be realized? $(1,3)$ will not remaino ptimal because $100$ is not within the allowable increase of $40(1,3)$ will remain optimal because $100$ is not within the allowable increase of $280.$ The minimum Cost will now be $ $780(1,3)$ will not remain optimal because $100$ is not within the allowable increase of $280(1,3)$ will remain optimal because $100$ is within the allowable increase of $280.$ The minimum Cost will now be $$780$ None of the above