In media asset application scenarios, large file is an important application feature. Huawei OceanStor 9000 can allocate quota according to different user, so as to avoid part of the non-critical data over occupy space, which of the following description about the quota is correct?

In media asset application scenarios, large file is an important application feature. Huawei OceanStor 9000 can allocate quota according to different user, so as to avoid part of the non-critical data over occupy space, which of the following description about the quota is correct?
A . Quota types include capacity quota and the number of files quota.
B . quotas ways include calculation quota, flexible quota and mandatory quotas.
C . system will pre-allocated quota for the file before writing to the file, when the user cancels write being written files, the system does not release pre-allocated quota.
D . When the user sustained write data, used quota information will be updated in real time in InfoAllocator interface.

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Answer: A