Which statement correctly connects the Australian Constitution with its commencement date?

Which statement correctly connects the Australian Constitution with its commencement date?

• AThe Australian Constitution came into effect on 1 January 1901.Correct
• BThe Australian Constitution came into effect before 1901.
• CThe Australian Constitution came into effect at the end of 1901.
• DThe Australian Constitution came into effect on 1 January 1910.

The supported statement is that the Australian Constitution came into effect on 1 January 1901. The other options give dates or timing not supported by the fact.