Which among the following relation is correct if BM ⊥ AC and BN is angle bisector of ∠ABC?

• A. ∠MBN = 1/2 (∠A – ∠C)
• B. ∠MBN = 1/2 (∠A + ∠C)
• C. ∠MBN = (∠A – ∠C)
• D. ∠MBN = (∠A + ∠C)