Which statement is true when creating an Account lookup field on the Project object?

The customer service team at Universal containers uses a custom Project object to track their customer projects. An App builder needs to create a relationship between the project object and the related client Account record. A private sharing model is in place for both Accounts and projects .

Which statement is true when creating an Account lookup field on the Project object? Choose 2 answers
A . The account lookup field on the project record can be made optional.
B . Cross-object field updates between the Project and Account records are not supported
C . Users can only delete Accounts if they have access to related projects records
D . The account record can include roll-up summary field with data from the project records

Answer: A,C