Which three reasons can explain btw?

Refer to the exhibit.

An administrator configured a FortiGate device to connect to me AWS API to retrieve resource values from the AWS console to create dynamic objects for the FortiGatepolicies. The administrator is unable to retrieve AWS dynamic objects on FortiGate.

Which three reasons can explain btw? (Choose three.)
A . AWS was not able to validate credentials provided by the AWS Lab SON connector.
B. The AWS Lab SON connector failed to connect on port 401.
C. The AWS Lab SON connector failed to retrieve the instance list.
D. The AWS API call is not supported on XML version I . O.
E. The AWS Lab SON connector is configured with an invalid AWS access or secret key

Answer: A,C,E