List three reasons people might be reluctant to use biometrics for authentication. Can you think of ways to counter those objections?

Changing the ________ of a picture changes the amount of gray in the picture

Fill in the blank(s) with correct word

Which category of primitive functions has a function that could test whether an object is above another object?

a. Point of view b. Proximity c. Size d. Spatial relation e. None of these