Explanation
Transform maps are used to transform imported hardware model data from an import set table to a target table, such as the Product Catalog or the Asset table1 Coalesce is an option that you can set on a field mapping to uniquely identify the same asset in order to merge or update records2 Coalesce means that the field is used as a unique key. If a match is found using the coalesce field, the existing record is updated with the imported information. If no match is found, a new record is inserted2 Coalesce helps to prevent duplicate records and ensure data consistency2 You can set coalesce on one or more fields in a transform map, but at least one coalesce field is required2 The other options, B. Consolidate, C. Unique identifier, D. Unique source, E. Unique target, and F.
Combine, are not valid options for setting the unique identification of assets in transform maps References: 1: Creating New Transform Maps - ServiceNow 2: [Coalesce - ServiceNow]