A graph of \(x\) versus \(t\) is shown in the figure.
             

(a) The particle was released from rest at \(t = 0.\)
(b) At \(B,\) the acceleration \(a > 0.\)
(c) Average velocity for the motion between \(A\) and \(D\) is positive.
(d) The speed at \(D\) exceeds that at \(E.\)

Choose the correct alternatives:
1. (b, d)
2. (a, b)
3. (b, c)
4. (a, d)