Select the incorrect statement.

• A

  If the zero of vernier scale does not coincide with the zero of the main scale, then the vernier callipers is said to be having zero error

• B

  Zero correction has a magnitude equal to zero error but sign is opposite to that of zero error.

• C

  Zero error is positive when the zero of vernier scale lies to the left of the zero of the main scale

• D

  Zero error is negative when the zero of vernier scale lies to the left of the zero of the main scale