Velocity - time graph of a particle executing SHM is as shown in fig. Select the correct alternatives.

i) at position 1, displacement of particle may be$+\text{ve or }-\text{ve}$                                

ii) at position 2, displacement of particle is $-\text{ve}$

 iii) at position 3, acceleration of particle is $+\text{ve}$

iv) at position 4, acceleration of particle is $+\text{ve}$

At position 1 : Velocity of particle is negative but after wards speed of particle is decreasing.

At position 2 : Velocity of particle is zero but after some time its velocity is $+\text{ve}$ i.e., in this position displacement is $-\text{ve}$

At position 3 : Velocity of particle is $+\text{ve}$ and it is still increasing i.e., acceleration is positive

At position 4 : Velocity of particle is maximum. i.e., acceleration of particle is zero