A light spring balance hangs from the hook of the other light spring balance and a block of mass $M$ $kg$ hangs from the former one. Then the true statement about the scale reading is
Both the scales read $M$ $kg$ each
The scale of the lower one reads $M$ $kg$ and of the upper one zero
The reading of the two scales can be anything but the sum of the reading will be $M$ $kg$
Both the scales read $M/2$ $kg$ each
