During a price improvement period, who is allowed to submit additional orders to the orderbook?

During a price improvement period, the protocol allows all trading participants, except for the trader who initiated the Improve Request, to submit additional orders to the order book. This mechanism is designed to foster competition and enhance price discovery, as it enables other participants to enter their orders in response to the price improvement request. By excluding the initiating trader from these additional submissions during the price improvement phase, the system encourages a fairer and more efficient matching process, ultimately benefiting the trading venue and contributing to a more liquid market.

In contrast, the other options limit participation in various ways that do not align with the goal of maximizing price improvement through broad engagement from market participants. Consequently, C is the correct and most inclusive option regarding who may submit additional orders during this period.