The bridge shown in figure has $$Z_{1} = 50  \angle 10^\circ Ω, Z_{2} = 10 \angle 0^\circ Ω, Z_{3} =  150 \angle -10^\circ Ω$$. For what value of $$Z_{4}$$ the bridge will be balanced ?

A

$$30 \angle 10^\circ Ω $$

B

$$30 \angle -20^\circ Ω$$

C

$$30 \angle 20^\circ Ω$$

D

$$30 \angle 0^\circ Ω$$