A positive charge Q is uniformly distributed along a circular ring of radius R. A small test charge q is placed at the center of the ring as shown in figure. Then which of the following is correct?

If q > 0 and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre. q at the center of the ring is in an unstable equilibrium within the plane of the ring.  If q < 0, it will be pulled at the circumference. None of the above.

If q > 0 and is displaced away from the centre in the plane of the ring, it will be pushed back towards the centre.