A half wavelength dipole is kept in the x-y plane and oriented along 45° from the x-axis. Determine the direction of null in the radiation pattern for 0 ≤ Φ ≤ π. Here the angle θ (0 ≤ θ ≤ π) is measured from the z-axis, and the angle Φ (0 ≤ Φ ≤ 2π) is measured from the x-axis in the x-y plane.

• A. θ = 90°, Φ = 45°
• B. θ = 45°, Φ = 90°
• C. θ = 90°, Φ = 135°
• D. θ = 45°, Φ = 135°