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When a system is called as unbreakable?

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When a system is called as unbreakable?

(a) When unique solution is available

(b) When unique solution is not available

(c) All of the mentioned

(d) None of the mentioned

I got this question during an online exam.

My query is from Cipher Systems and Secrecy of Cipher Systems in chapter Spread Spectrum Techniques of Digital Communications

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The correct choice is (b) When unique solution is not available

For explanation: A system is said to be unbreakable when unique solution is not available because of the number of equations being smaller than the number of unknown key bits.

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