Which of the following techniques is based on a set of criteria that has been acquired in a specific knowledge area or product area?

Expert judgment is formally defined as a technique that draws on specialized knowledge, skills, and experience accumulated within a specific application area, knowledge domain, or industry to evaluate inputs and guide outputs. This definition directly matches the question's description of criteria acquired in a specific knowledge or product area, and it is recognized in frameworks such as PMBOK as a primary tool for estimation and decision-making.

Function points are a quantitative software sizing metric that measures application functionality based on inputs, outputs, queries, and data files - they are a measurement unit rather than an expertise-based technique.

A PERT chart is a project scheduling diagram that models task dependencies and estimates timelines using optimistic, pessimistic, and most-likely durations - it is a planning visualization tool, not a knowledge-based criteria technique.

The Delphi technique is an iterative, anonymous consensus process in which multiple experts independently submit estimates that are aggregated and fed back for successive refinement rounds - its defining characteristic is structured anonymity and iteration, not simply the application of domain knowledge.