When handling and executing a client order a participant must take reasonable steps to obtain the best outcome: best total consideration for retail clients (unless validly instructed otherwise), and the relevant outcome for wholesale clients; it must not induce clients to give contrary instructions or waive disclosure, and must not charge different fees by execution venue unless the difference reflects actual cost.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.