Microservice architecture will face multi-dimensional challenges. Which of the following are the challenges that microservice architecture needs to face? (Multiple Choice)

Microservice architecture will face multi-dimensional challenges. Which of the following are the challenges that microservice architecture needs to face? (Multiple Choice)
A . Increased failure probability, difficulty in monitoring and tracking, high calling frequency, long calling chain, and uncontrollable factors in cross-virtual machine and VLAN communication increase.
B . You can choose components freely according to the needs of the service, and you don’t have to worry about dependency conflicts. Microservices manage their own data.
C . Data is no longer centrally managed and distributed to various microservices. Conventional transaction management cannot cross service boundaries.
D . It is easy to realize automated testing, with clear test cases, clear external dependencies, and easy piling (API pre-defined)

Answer: AC