Theory of Machine
The velocity of any point in mechanism relative to any other point on the mechanism on velocity polygon is represented by the line

Joining the corresponding points
Perpendicular to line as per (A)
At 45° to line as per (A)
Not possible to determine with these data

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Theory of Machine
The Ackerman steering gear mechanism is preferred to the Davis steering gear mechanism, because

The Ackerman steering gear consists of turning pairs
Both (A) and (B)
Whole of the mechanism in the Ackerman steering gear is on the back of the front wheels
The Ackerman steering gear is most economical

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