The client has 50,000 products in their catalogue. The information held for each product is very basic. manufacturer, product number, description, price, and a specification field that is unique to the client's business.What is the most efficient way to migrate these products to SAP Business One using the Data Transfer Workbench? 

Add a user-defined field to the item master data for the specification field. Create a customized data import file based on the item master data template. You can select the user-defined field to be included in the import file.

Import the products using the item master data template, and in the data import wizard map the specification field to an unused field, such as the the item properties. 

Import the products using the inventory posting template. This template contains the basic fields needed by the client. Enter the specification field in a suitable unused field in the template spreadsheet. 

Add a user-defined field to the item master data for the specification field. Enter the product data, including the new specification field, in the standard item master data template.