Answer / cyril

A, C and D.

Polarities of the two transformers must be the same. Otherwise, emf inducted in the 2 secondaries in parallel will cause a flow of circulating current through them, even without a connected load.
Voltage ratios must be the same. Otherwise, there will also be a flow of circulating current in the 2 secondaries if there is a voltage ratio difference.
Percentage impedance must be the same since load sharing of the transformers in parallel depends on the percentage impedance of the transformers.

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