According to IEC 60445 wiring colour codes, the neutral conductor is identified by:
Blue
Wiring colour codes exist so that any electrician can identify a conductor's function at a glance, which is essential for safe connection and maintenance.
The IEC 60445 standard fixes these identification colours for the line, neutral and protective conductors of an installation.
Under this standard the neutral conductor, which is the return path carrying current back to the supply, is identified by the colour blue.
The line (phase) conductor under the same standard is brown, so blue is deliberately kept distinct from it to avoid dangerous mix-ups.
Green-yellow is reserved exclusively for the protective earth conductor and must never be used for neutral, so that option is wrong.
Red is an older phase colour from earlier codes and does not denote neutral in the IEC scheme, so it too is incorrect.
Hence, the answer is Blue.
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