Which two configuration requirements should be considered when troubleshooting?

A consultant configured a triggered send definition in Sales Cloud for a customer using Marketing Cloud Connect, The trigger is on a Custom Object called ‘Shipments’ and is enabled for Triggered Sends in Setup.

Which two configuration requirements should be considered when troubleshooting? (Choose 2 answers)
A . The Shipment object is on the Account Related List.
B . There is a Master Detail Relationship from Contact to Shipment.
C . The Shipment object requires a Lookup to Lead or Contact.
D . An Apex Trigger is created on the Shipment object.

Answer: A,C