Select the incorrect statement regarding cost structures.Choose one: $1.$ When sales change, the amount of the corresponding change in income is affected by the company$/$s cost stracture$2.$ Highly leveraged companies will experience greater profits than companies less leveraged when sates increase$\mathrm{.}3.$ The more variable cost, the higher the fluctuation in income as sales fuctuate$\mathrm{.}4.$ Faced with significant uncertainty about future revenues, a low leverage cost structure is preferable to a high leverage cost structure