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If cos^(-1)x+cos^(-1)y+cos^(-1)z=pi, the...

If `cos^(-1)x+cos^(-1)y+cos^(-1)z=pi,` then,
a. `x^2+y^2+z^2+x y z=0` b. `x^2+y^2+z^2+2x y z=0`
c.`x^2+y^2+z^2+x y z=1` d.`x^2+y^2+z^2+2x y z=1`

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