What is the difference between the perfect competitor's VMPL curve and the imperfect competitor's MRPL curve? select the correct option below: (a) The VMPL takes into account that the sale of additional output requires a cut in price (b) The VMPL measures the addition to total revenue from the addition of a unit of labour (c) The MRPL takes into account that the sale of additional output requires a cut in price (d) The MRPL measures the addition to total revenue from the addition of a unit of labour