The correct answer is C. SCADA is a system.
SCADA stands for Supervisory Control and Data Acquisition. It is a system that collects and monitors data from remote devices, such as sensors and meters, and then uses that data to control those devices. SCADA systems are used in a variety of industries, including energy, water, and transportation.
A software is a set of instructions that tells a computer what to do. A process is a series of steps that are followed to complete a task. Hardware is the physical components of a computer, such as the CPU, memory, and storage.
SCADA is not a software, process, or hardware. It is a system that uses software, processes, and hardware to collect and monitor data from remote devices and then use that data to control those devices.