An electron moves around another charge in closed orbit. The de-Broglie wavelength of electron varies cyclically between two values ${\lambda }_1$ and  ${\lambda }_2$ with ${\lambda }_1>{\lambda }_2.$  Which of the following statements are true?

Electron could be moving in elliptical orbit around the other charge.

If electron is moving in an elliptical orbit then de-Broglie wavelength of electron is ${\lambda }_1$ when it is at the farthest point and when electron is nearer the other charge then its value is  ${\lambda }_2.$

Total energy of the system is constant. 

Electron could be moving in circular orbit around the other charge