Which two design considerations are required to add the Cisco Email Security Appliance to an existing mail delivery chai

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Which two design considerations are required to add the Cisco Email Security Appliance to an existing mail delivery chain? (Choose two.)

A. Existing MX records should be maintained and policy routing should be used to redirect traffic to the ESA.
B. Update the MX records to point to the inbound listener interfaces on the ESA.
C. Update the MX records to point to the outbound listener interfaces on the ESA.
D. Different Listeners must be used to handle inbound and outbound mail handling.
E. The ESA should be connected to the same subnet as the Email Server because it maintains only a single routing table.
F. The ESA can be connected to a DMZ external to the Email Server because it maintains multiple routing tables.
G. The ESA can be connected to a DMZ external to the Email Server but it maintains only a single routing table.
H. Mail Listeners by default can share the same IP interface by defining the routes for sending and receiving.