Arcitura Education Exam S90.18 Topic 4 Question 93 Discussion

Service A sends a message to Service B which reads the values in the message header to determine whether to forward the message to Service C or Service D. Because of recent attacks on Services C and D, it has been decided to protect the body content of messages using some form of encryption. However, certain restrictions within the design of Service B will not permit it to be changed to support the encryption and decryption of messages. Only Services A, C and D can support message encryption and decryption. Which of the following approaches fulfill these security requirements without changing the role of Service B?