Please calculate the reflection coefficient at load: \[ Z_{L}=30-j 20 \] A) \( (100-30) /(100+30)=0.53 \) B) \( (30-100) /(30+100)=-0.53 \) C) \( (100-30+j 20) /(100+30 \cdot j 20) \) D) \( (30-j 20-1