The microservices architecture will face multiple dimensions. Which of the following are the challenges that the microservices architecture needs to face? (Multiple Choice)

The microservices architecture will face multiple dimensions. Which of the following are the challenges that the microservices architecture needs to face? (Multiple Choice)
A . The probability of failure increases, the monitoring and tracking is difficult, the calling frequency is high, the calling chain is long, and the uncontrollable factors of communication across virtual machines and VLANs increase.
B . The components can be freely selected according to the needs of the service, and the microservices manage their own data without worrying about conflicts.
C . Data is no longer centrally managed and distributed to individual microservices, and regular transaction management cannot cross service boundaries.
D . Easy to implement automated testing, clear test cases, clear external dependencies, and easy piling (API pre-defined).

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Answer: AC