PaaS provides the development and running environment for applications, including middleware and databases. Which of the following upper-layer server software belongs to the PaaS layer? (Multiple choices)

PaaS provides the development and running environment for applications, including middleware and databases. Which of the following upper-layer server software belongs to the PaaS layer? (Multiple choices)
A . KVM 【 laas 】
B . MySQL
C . CRM 【 SaaS 】
D . Java

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Answer: BD