If a2 + b2 + c2 = ab + bc + ca, then the value of \(\rm \frac{11a^4+13b^4+15c^4}{16a^2b^2+19b^2c^2+17c^2a^2}\) is:

1
\(1\frac{1}{3}\)
2
\(\frac{1}{4}\)
3
\(\frac{3}{4}\)
4
\(1\frac{3}{4}\)

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