What Happens to an Electron's Wave Packet If an Accurate

Multiple Choice

What happens to an electron's wave packet if an accurate velocity measurement is performed?

A) It suddenly changes to a new wave packet having a very small uncertainty in position, but a large uncertainty in velocity.
B) Neither the wave packet nor the electron is affected by the measurement.
C) It suddenly changes to a new wave packet having a very small uncertainty in velocity, but a large uncertainty in position.
D) The wave packet is unaffected by the measurement, even though the electron itself makes a sudden change of state that is caused by the measurement.
E) It suddenly changes to a new wave packet having small uncertainties in both velocity and position.