Ra is resistance at A, Rb is resistance at B, Rc is resistance at C in star connection. After transforming to delta, what is resistance between B and C?

• A. Rc+Rb+Rc*Rb/Ra
• B. Rc+Rb+Ra*Rb/Rc
• C. Ra+Rb+Ra*Rc/Rb
• D. Rc+Rb+Rc*Ra/Rb