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Your organization is enforcing a new security policy to manage firewall rules for traffic control between virtual machines (VMs). Following Google-recommended practices, you must create a firewall rule to strictly regulate traffic between VM A and VM B within the VPC. The rule should permit only unidirectional communication from VM A to VM B and block all other traffic paths. Assume no other firewall rules exist in the VPC. What firewall rule configuration will achieve this requirement?