Answer:
i. The training method was on-the-job training.
ii. Christine's performance error was stereotyping.
Explanation: On-the-job training is a learning process in which a worker is trained on how to perform certain tasks by actually doing those tasks, where an experienced colleague, supervisor or manager will usually serve as the trainer.
Stereotyping is the act for generalizing a particular category of people, it is having an expectation of a person or group of persons that they might behave or act in a certain way.
Christine in the scenario above, has ranked Jon using a stereotype that he is young new to the job, therefore that is the reason why he did not perform well or up to standard.