Training credentials are used to confirm an individual's: A. skill development.
A training credential can be defined as a formally written and signed document that is typically issued by a training institute to a trainee after learning and gaining the requisite knowledge over a specific period of time.
This ultimately implies that, a training credential are designed and developed to confirm that a particular trainee has acquired and possesses a skill, knowledge, understanding, etc.
Read more on training credential here: https://brainly.com/question/8224944