This is a question with answer options. Goal: how to use a computer mouse

Which of the following methods is more reasonable for accomplishing this goal?

Options are: a. plug the mouse into the usb drive of the computer, either on the keyboard or cpu tower, then it should sync automatically and allow you to move the mouse.. b. put the mouse on the mousepad and move it around to move the cursor on the screen to the desired area or action. this is all that is needed to operate the mouse.....I think the answer is
a.