In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, the acceleration of the piston is _________ when the crank OC and connecting rod PC are at right angles to each other.

A. Infinity

B. Zero

C. Any +ve value

D. Any -ve value

Please do not use chat terms. Example: avoid using "grt" instead of "great".