Huawei Cloud provides a key management service well and multiple basic cloud services to connect, providing convenient data encryption protection for tenants on the cloud. Which of the following services does not support direct use of key instances?

Huawei Cloud provides a key management service well and multiple basic cloud services to connect, providing convenient data encryption protection for tenants on the cloud. Which of the following services does not support direct use of key instances?
A . Object Storage Service (OBS)
B . NAT gateway
C . Cloud Hard Disk Service (EVS)
D . Relational database service (RDS)

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Answer: B