Which of the Following Is the Accepted Standard for a Stable

Which of the following is the accepted standard for a stable endosseous implant 1 year after placement?

A) Vertical bone loss less than 0.2 mm per year
B) Vertical bone loss more than 0.2 mm per year
C) Horizontal bone loss less than 2 mm per year
D) Horizontal bone loss more than 2 mm per year