When an Entity First Publishes Its Financial Statements Using IFRS

When an entity first publishes its financial statements using IFRS, which of the following may be used:

A) IFRS effective at the end of the each reporting period presented.
B) IFRS effective at the beginning of the current period presented; previous periods may still be presented using previous GAAP.
C) IFRS effective at the end of the current period retroactively applied to current and all previous periods presented.
D) IFRS effective at the end of the current period presented; previous periods may be presented using previous GAAP.