Final answer:
Supervisors or management personnel are usually the ones who should be made aware of and authorize the placing of systems out of service during a planned removal.
Step-by-step explanation:
During a planned removal from service, the individuals who should be made aware of and authorize the placing of systems out of service are usually the supervisors or management personnel responsible for the operation and maintenance of the systems. These individuals have the knowledge and authority to assess the impact of the system's removal on the organization's operations and make informed decisions. In some cases, additional stakeholders, such as IT support staff or relevant department heads, may also need to be informed and involved in the decision-making process.