निम्नलिखित विद्युत चुंबकीय तरंगों में से कौन सी तरंग तरंगदैर्घ्य (wavelength) में एक्स-रे (X-rays) के सबसे करीब है?

Match List I (Electromagnetic wave) with List II (Production method): List I: A. Microwave B. Visible light C. Gamma rays D. Infrared rays List II: I. Electrons in atoms emit light when moving from a higher to a lower energy level II. Radioactive decay of the nucleus III. Vibration of atoms and molecules IV. Klystron valve or magnetron valve Choose the correct matching:

For a plane electromagnetic wave propagating along the +x-direction, which of the following combinations gives the correct possible directions for the electric field (E) and magnetic field (B) respectively?