Which of the Following Statements Is an Incorrect Statement in Respect

Which of the following statements is an incorrect statement in respect of Model Code recommendations concerning electronic trading?

A) It is recommended that ECNs have mechanisms that control price flashing
B) A manual kill button that disables the system's ability to trade and cancels all resting orders may not be established without Central Bank approval
C) The sudden withdrawal of a specific credit limit or limits in a tactical manipulation to mislead the market is unethical
D) Algorithms require appropriate supervision performed by staff with commensurate levels of experience