Ted, a senior employee, believes he is underpaid and attempts to compensate by routinely keeping short hours, though it is obvious to everyone that he still makes some valuable, unique, and perhaps irreplaceable contributions. Tatiana, Ted' s supervisor, is aware of the deficit in Ted' s performance, and realizes other workers work harder than they should to make up for it. Nevertheless, Tatiana decides that she should not request that Ted be replaced. Which one of the following principles, if valid, would most help to justify Tatiana's decision? ['Supervisors should request that an employee be replaced only if they know that all the work done by that employee can be performed equally well by another employee.', 'Workers in a work setting should regard themselves as jointly responsible for the work to be performed.', "Only someone with greater authority than a particular employee's supervisor is entitled to decide whether that employee should be replaced.", 'Employers should compensate all their employees in a way that is adequate in relation to the value of the contributions they make.']