Final answer:
The question pertains to identifying the last piece of data within a structured set of records or database, and the correct answer is 'Last field of the last record', emphasizing the uniqueness and non-redundant nature of data fields in a record.
Step-by-step explanation:
The question seems to be asking about record management or data organization in a database or a similar structured data context. Considering the given options, the correct answer to the question is arguably 1) Last field of the last record. This is because when dealing with records, whether in databases, spreadsheets, or other forms of data storage, the term 'last record' refers to the final entry in the series of records, and within this context, the 'last field' would mean the final piece of data or column in that record. It is unique because in a well-formed dataset, each field can only represent one value per record at any given time, and crossing or overlapping of field data would result in ambiguity, which is not permitted.