**Concept: The question tests on concepts of equations**

**Solution: **

For any 2 equations of the for a1x + b1y = c1 and a2x + b2y = c2, we get a unique solution when a1/a2≠b1/b2

Therefore in the system of equations given, we get a unique solution when k/4≠1/k

Solving, we get k^2≠4, or k≠±2 which is the same as |k| ≠ 2**Option C**

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