You are processing photos of runners in a race. You need to read the numbers on the runners` shirts to identity the runners in the photos. Which type of computer vision should you use? 

Answer options:

A. facial recognition
B. optical character recognition (OCR)
C. semantic segmentation
D. object detection

B

Optical character recognition (OCR) allows you to extract printed or handwritten text from images and documents. Reference: https://docs.microsoft.com/en-us/azure/cognitive-services/computer-vision/overview-ocr