Is the easiest kind of training to implement, when the job requires simple tasks and/or is repetitive.

On-the-job training

Explanation:

 The on-the-job training is one of the type of hands-on training session which is provided by the company for training the knowledge, skills and the competencies required for performing the specific job task in an organization.

It is also known as OJT and it is important in terms for human resource management system. During the on-the-job training the employees learn and also practices for acquiring the knowledge.

According to the given question, the on-the-job training is one of the easiest way of training for performing the various types of simple tasks and may be repetitive in the job.

Therefore, On-the-job training is the correct answer.