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Three identical balls 1, 2 and 3 are pla...

Three identical balls 1, 2 and 3 are placed together at rest on a smooth horizontal surface. A fourth identical ball moving with velocity u in line of first three balls collides head on elastically as shown in figure, then

A

Fourth ball comes to rest with second and third ball while first ball moves with velocity u.

B

Fourth ball comes to rest and other three moves with speed u/3.

C

All the balls will move together with speed `u/3`

D

All the balls will move together with speed `u/4`

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