C)Hydroelectric I believe.
Answer: Discretionary access control (DAC)
Explanation: Discretionary access control is the control system that is imposed over the information system. The information systems contains different objects and subjects that gets the permission to do the operations.
The operation which the components can do are sharing the data to other object or subjects, privilege providence, change in the rules for the access, security entities getting changed etc.
Answer: An operating system manages and runs all of the hardware and software installed onto the computer.
Explanation:
It performs basic tasks such as file, memory, and process management, handling input and output, and controlling peripheral devices such as disk drives and printers.
In the scenario in which Derek Miller's social media post is different than most since Miller had his family and friends write a post after he died with the letter he wrote. Hope this is the answer and would be of help.