If x2 = y + z, y2 = z + x and z2 = x + y, then what is the value of \(\frac{1}{{x\; + \;1}} + \frac{1}{{y\; + \;1\;}} + \frac{1}{{z\; + \;1}}\;?\)

• A. -1
• B. 1
• C. 2
• D. 4