Any sale item that is purchased can be returned for store credit but not for a refund of the purchase price. Every home appliance and every piece of gardening equipment is on sale along with selected construction tools. If the statements above are true, which one of the following must also be true? ['Any item that is not on sale cannot be returned for store credit.', 'Some construction tools are not returnable for store credit.', 'No piece of gardening equipment is returnable for a refund.', 'None of the things that are returnable for a refund are construction tools.']