The second's hand of a watch has 6cm length. The speed of tis tip and magnitude of difference in velocity of its at any two perpendicular positions will be respectively:
A. 2 and 0 mm/s
B. 2л and 2√3л mm/s
С. 2√2л and 2л mm/s
D. 2√2л and 4. 44 mm/s