An electron moving in the direction of the +2-axis enters a region of uniform magnetic field. If the electron experiences a magnetic deflection in the -x direction, the direction of the magnetic field in this region points in the direction of:___________.
1. O+z-axis
2. O-z-axis
3. 0-x-axis
4. O %-axis
5. Oty-axis
6. O-y-axis