Which of the following is referred to as SQPP?

The correct answer, referring to SQPP, is Secondary Inspection Query - Air. This term is used in the context of U.S. immigration processes, particularly in relation to the examination and processing of individuals arriving at air ports of entry. SQPP specifically deals with cases where additional security or background checks are warranted. It implies a more thorough inspection to verify the traveler's eligibility for entry into the U.S. This term is crucial for asylum officers as it involves understanding the processes and systems in place when handling cases of individuals who may have complex backgrounds or are flagged for further assessment.

In comparison, the other choices do not align with the SQPP terminology used within the immigration framework. Machine Readable Document, for example, relates to documents that can be read by machines to facilitate processing but does not encompass the procedural aspects of additional inspections at air entry points. Multiple Item Subject Query and Consolidated Record Query refer to different types of data handling and information retrieval methods that are not specific to the context of secondary inspections at air borders.