A loss-less line length x such that $$\beta {\text{x}} = \frac{\pi }{2}$$   is connected in between a line of characteristic impedance of 100 Ω and a load impedance of 400 Ω. The line so connected should have a characteristic impedance of

A. Radar B. Direction finding C. Satellite communication D. All of the above

A. Scalar B. Vector C. Unit vector D. None of the above

A. Hertz antenna B. Marconi antenna C. Folded dipole D. None of the above

A. Accelerating B. Retardation C. Oscillating D. Lagging the current