Which Statement Best Describes the Procedure Used to Assess Capillary

Which statement best describes the procedure used to assess capillary refill?

A) Briefly press the tip of the nail with firm,steady pressure,then release and observe for changes in color.
B) Press firmly with your fingertip for 5 seconds over a bony area,release pressure,and observe the skin for the reaction.
C) Tap on the skin with short strokes from your fingers.
D) Lift a fold of skin and allow it to return to its normal position.