Answer: Cross-training
Step-by-step explanation:
According to the given question, Mary's company give training for managing the various types of managerial level operations and functions and based on the given information Mary's company is providing the cross training.
The cross training is one of the type of training that is provided by an organization to their employees for developing their skills and knowledge.
The main objective of the cross training is that it helps an employee to boost their skills, functions so that it improves the quality and the productivity of an organization.
Therefore, Cross training is the correct answer.