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Using a bar magnet $P$, a vibration magnetometer has time period 2seconds. When a bar $Q$ (identical to $P$ in mass and size) is placed on top of $P$, the time period is unchanged. Which of the following statements is true

• A
  (a) $Q$ is of non-magnetic material
• ✓
  (b) $Q$ is a bar magnet identical to $P$, and its north pole placed on top of $P_s$ north pole
• C
  (c) $Q$ is of unmagnetized ferromagnetic material
• D
  (d) Nothing can be said about $Q$ s properties