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If vec a xx vec b = vec c and vec b xx ...

If `vec a xx vec b = vec c` and `vec b xx vec c = vec a`, then which one of the following is correct? (a) `vec a, vec b, vec c` are orthogonal in pairs and `|vec a|= |vec c| and |vec b |=1` (b) `vec a, vec b , vec ` are non orthogonal to each other (c) `vec a, vec b , vec c` are orthogonal in pairs pairs but `|vec a| != |vec c|`

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