a + b + c = 0, then the value of $$\frac{{{a^2} + {b^2} + {c^2}}}{{ab + bc + ca}}$$ is? Options: A . &nbsp2 B . &nbsp-2 C . &nbsp0 D . &nbsp4

a + b + c = 0, then the value of $$\frac{{{a^2} + {b^2} + {c^2}}}{{ab + bc + ca}

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