A manufacturing company has implemented just in time (JIT) into their process. JIT is part of:

A) total quality management
B) the theory of constraints.
C) process re-engineering.
D) the lean business model.

Just in time (JIT) is part of the lean business model, which focuses on minimizing waste and maximizing efficiency in production processes. Total quality management (A) focuses on ensuring quality in all aspects of the organization, the theory of constraints (B) focuses on identifying and managing bottleneck processes, and process re-engineering (C) focuses on redesigning and improving entire business processes. While these approaches may also involve aspects of efficiency and waste reduction, they do not specifically incorporate the JIT approach.