If a+ b + c = 0, then the value of \(\frac{1}{{{b^2} + {c^2} - {a^2}}} + \frac{1}{{{c^2} + {a^2} - {b^2}}} + \frac{1}{{{a^2} + {b^2} - {c^2}}}\) is

• A. 3
• B. 0
• C. 1
• D. None of the above