The author said to me: Did you buy my book? The previous sentence in t...

The author said to me: Did you buy my book? The previous sentence in the Reported Speech is:

The author said to me if I had bought his book.

The author told me if you bought his book.

The author asked me if you bought his book.

The author asked me if I had bought his book.

The author said to me if you have bought my book.

The author said to me: Did you buy my book? The previous sentence in the Reporte...