The lot size key specifies the Question 18 options: 1) Optimum lot size for a group of materials. 2) Recommended lot size for a material. 3) Procedure used to determine the capacity of a storage area. 4) Lot size groups per each material type. 5) Procedure that is used to determine the lot size. a) Optimum lot size for a group of materials. b) Recommended lot size for a material. c) Procedure used to determine the capacity of a storage area. d) Procedure that is used to determine the lot size.