What is the quickest way to select entire worksheet?

Question:What is the quickest way to select entire worksheet?

1.Choose Edit -> Select all from the Menu

2.Click on the first column, press Ctrl, and then click on the last column

3.Click on the first column, press Shift, and then click on the last column

4.Click on the rectangle box on the upper left corner where column headings and row headings meet

Answer:4