Which statements about Message Markers are correct?

Which statements about Message Markers are correct?

A.Instruction: The recipient has to follow this message unless there is contradictory safety reasons which have to be reported to the sender.

B.Advice: The decision whether to follow it stays with the recipient, but one should consider it very carefully.

C.Warning: The recipient of a warning should pay immediate attention to the danger mentioned. Consequences of a warning will be up to the sender.

D.Information: Consequences of an information will be up to the recipient.

正确答案是ABD