Which statements regarding continuous trading are true?

The statement that continuous trading starts with an auction phase for all instruments, including simple and complex, is indeed accurate. In many trading systems, continuous trading begins after an initial auction phase, which helps to establish a fair opening price and allows for price discovery before trading continues. This is essential in ensuring that there's a systematic approach to moving into continuous trading, providing liquidity and stability to the market.

Regarding the event of a crossed order book, when buy orders exceed the sell orders at a certain price level, uncrossing does indeed happen before the continuous trading commences. This process smooths the transition into continuous trading by resolving any price discrepancies and ensuring that orders can be matched efficiently without issues.

In terms of execution, multiple allocation methods can facilitate order execution during continuous trading, which is important for handling different types of orders and ensuring that participants can execute trades as intended. Lastly, market data being published on an aggregated basis enhances transparency and provides a clearer picture of market conditions for participants.

The correct answer aptly emphasizes the importance of the uncrossing process in maintaining market integrity before continuous trading begins, thereby ensuring that the trading environment is fair and conducive for participants.