• (A) A rigid link rotates instantaneously relative to another link at the instantaneous centre for the configuration of the mechanism considered.
• (B) The two rigid links have no linear velocity relative to each other at the instantaneous centre.
• (C) The velocity of the instantaneous centre relative to any third rigid link is same whether the instantaneous centre is regarded as a point on the first rigid link or on the second rigid link.
• (D) All of the above