When the switch in the secondary circuit is closed, which is true

When the switch in the secondary circuit is closed, which is true?
we talking about transformers here.

a.The primary and secondary have equal powers.

b. The primary and secondary have equal currents.

c. The primary and secondary have equal rates of dissipation.

d. The primary and secondary have equal voltages.

The answer is
a) The primary and secondary have equal powers

However, only in an ideal transformer is the input power equal to the output power of a transformer. Real transformers have loss so the output power is slightly less than the input power.

a. It is not exactly correct, but none of the other answers are correct.