Read the passage and answer the question.Vicarious Liability is a legal principle where one person is held liable for the tort committed by another. This typically occurs in a "Master-Servant" relationship. For the Master to be held liable, two conditions must be met: (1) There must be a formal master-servant relationship, and (2) The tortious act must be committed by the servant "in the course of employment."An act is considered within the "course of employment" if it is either a wrongful act authorised by the master, or a wrongful and unauthorised mode of doing some act authorised by the master. However, if a servant performs an act that is totally unconnected to their job (a "frolic of their own"), the master is not liable. Furthermore, an independent contractor is different from a servant; a master is generally not liable for the torts of an independent contractor because the master lacks the right to control how the work is done.Which of the following is the most essential element to establish a Master-Servant relationship?