The answer is "b. Salary".
A salary is a type of payment from a business to a worker, which might be determined in a work contract. It is stood out from piece compensation, where each activity, hour or other unit is paid independently, as opposed to on an intermittent premise. From the perspective of maintaining a business, compensation can likewise be seen as the expense of procuring and holding HR for running tasks, and is then named work force cost or pay cost.