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.
Answer: A