Discuss the fact that it is important to test for invalid input for the initial sentinel value when using while loops. How might you modify the code in Examples 5-4 and 5-5 to account for an invalid initial sentinel value? In other words, you would like the condition of the while loop to be tested at least once without input failure, and you would also like to avoid an infinite loop. Would initializing the sentinel variable during its declaration be helpful?

the answer is b) 2nd

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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.