Which of the following principle is violated if computer system is not accessible?

Explanation:

Authentication

I hope you help

system programmer option d is correct

because an operating system is software that manages computer hardware and system resources.

yes we can change both the color of the value of a cell as well as background color of a cell at the same time .

as we know that excel sheet consists of columns and rows.

and intersection of column and row is called cell.

we can change color of the cell and background of the cell at the same time.

hence the statement that

can a person change color of the cell and background of the cell at the same time is true.