Final answer:
The 'Floating location system' is not a recognized method of order picking, making it the correct answer. Other options like the 'Zone system' and 'Multi-order system' are legitimate methods used within warehouse operations.
Step-by-step explanation:
In the context of warehouse operations and logistics, order picking refers to the process of retrieving products from their storage locations to fulfill customer orders. Among the provided options, a) Zone system refers to a picking method where the warehouse is divided into different zones, and pickers are assigned to specific zones. b) Floating location system is not a standard term used in order picking methodology, making it the correct answer as it is NOT a method of order picking. The system that actually exists and resembles this term is the random location system, where items are placed in any available location, making retrieval based on a database system rather than a fixed location. c) Multi-order system involves picking multiple orders simultaneously to increase efficiency. d) Area system is similar to the zone system but may refer to larger areas or entire sections of the warehouse dedicated to certain product types or order profiles.