The radiation pattern of two non - directional radiators fed with equal currents (with a phase shift) shown in figure belongs to(a) d = λ/2(b) α = −90°(c) d = λ/4(d) α = 0°

• A. (a) and (b) are correct
• B. (b) and (c) are correct
• C. (c) and (d) are correct
• D. (a) and (d) are correct