Which two statements are true when creating a Student Lookup field on the Training object?

The Training team at Universal Containers uses a custom Training object to track their customer trainings. An app builder needs to create a relationship between the Training object and the related Students’ record. A private sharing model is in place for both Students and Training.

Which two statements are true when creating a Student Lookup field on the Training object? (Choose two.)
A . On Training record, the Student Lookup field can be made optional.
B . On Student record, users can set on Roll-up summary field on Training records.
C . On Training record, users can only delete Students, if they have access to it.
D . Cross-object field updates between Training and Student records are not supported.

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Answer: AC