An alternating current of frequency f f\,f flows in a vertical transmitting antenna. An electromagnetic wave is emitted and propagates horizontally due east towards a receiver at point PPP, as shown in the diagram.
Which statement correctly describes the orientation and frequency of the oscillating electric field (EEE) and magnetic field (BBB) of the wave at point PPP?
EEE oscillates vertically, BBB oscillates horizontally north-south, both with frequency fff.
EEE oscillates horizontally north-south, BBB oscillates vertically, both with frequency fff.
EEE oscillates vertically, BBB oscillates horizontally east-west, both with frequency fff.
EEE oscillates vertically with frequency fff, BBB oscillates horizontally north-south with frequency 2f2f2f.