The value of \(\rm {\frac{1}{1 + x^{b -a} + x^{c - a}}+ \frac{1}{1 + x^{a-b} + x^{c - b}}+ \frac{1}{1 + x^{a-c} + x^{b - c}}}\) equal to:
1
\(\rm \frac{x^a}{x^a + x^b + x^c}\)
2
\(\rm \frac{x^b}{x^a + x^b + x^c}\)
3
\(\rm \frac{x^c}{x^a + x^b + x^c}\)
4
1