challenge: In what year was Thermal Acoustic Imaging (TAI) initiated, and what was the approach taken by P&W regarding training and certification?
  
  A. 2015, with the implementation of a certification program for experienced professionals only
  B. 2005, with the categorization as a new and emerging technology, allowing TAI to be performed without formal training and certification
  C. 2000, with the establishment of a formal training program and certification requirements
  D. 2010, with a focus on on-the-job training and peer review
  Answer: 