A plane figure moves in its plane. The velocity vectors of two different points on the plane figure are the same at a instant. Which statements are correct?

A、All points in the plane figure have the same velocity at this instant.;
B、All points in the plane figure have the same acceleration at this instant.;
C、The angular acceleration of the plane figure must be zero, but the angular velocity may not be zero at this instant.;
D、The angular velocity of the plane figure must be zero, but the angular acceleration may not be zero at this instant.