In older systems, often the user interface mainly consisted of screens that allowed a user to send commands to the system.
1. network-control
2. process-control
3. quality-control
4. physical-control

Option (2) i.e.,  process-control is the correct answer

Explanation:

In the following statement, Process-control screen provides users to send command to the system when the interface of the following users is mainly made up of in the older systems. So, that's why the user interface generally consists of a process-control screen which permits the user to transfer the following details in the system.

answer; i believe the correct answer is layers;