Question

The operating system should be designed
to assure that all available resources like _______
are used efficiently​

Answer 1

Explanation:

Most computer users sit in front of a PC, consisting of a monitor, keyboard, mouse, and system unit. ... The operating system in such cases is designed to maximize resource utilization — to assure that all available CPU time, memory, and I/O are used efficiently and that no individual user takes more than her fair share.

Answer 2

The operating system should be designed  to assure that all available resources like CPU and I/o devices are used efficiently​.

• The primary purpose of any operating system is to manage the computer's present resources like CPU, printer, disk drives, memory, etc.
• Operating systems naturally have a standardized programming interface in key addition to resource allocation, such that all programs typically use the modern hardware in the same way.  
• The operating system needs to correctly assign adequate time to each process and practical application of the modern processor so that they can operate as effectively as possible.