To answer this question, we need to understand the concepts of data elements and domains in the context of table fields.
A data element is a basic building block in SAP systems that defines the characteristics and attributes of a field. It provides the technical definition of a field, such as its data type, length, and other properties. A data element provides a consistent definition for a field across different tables and programs.
A domain, on the other hand, represents the value range and possible values that a field can have. It defines the technical attributes and constraints of a field, such as its data type, length, and allowed values. A domain is more specific than a data element and is used to define the characteristics of a field within a particular context.
Based on this information, we can conclude that the complete technical definition of a table field is determined by the field's domain. The domain specifies the data type, length, and other technical attributes of the field, while the data element provides a consistent definition for the field across different tables and programs.
Therefore, the correct answer is B) Domain.