Final answer:
To select multiple columns and rows, one should press and hold the control key while clicking on each column or row heading desired.
Step-by-step explanation:
To select multiple columns and rows in a spreadsheet or similar application, the correct method is: (b) press and hold control while clicking on the individual column or row headings you want to select. Simply dragging across the column or row headings will not allow non-adjacent selections. The options of typing over with new text and marking the new border of the columns and rows are not related to selecting multiple columns and rows.