In which two scenarios must an administrator add more space so a customer can write to the file system? (Select 2)

In which two scenarios must an administrator add more space so a customer can write to the file system? (Select 2)
A . The number of snapshots reaches a maximum.
B . The grace period for the quota expires.
C . The file system reaches a soft limit.
D . The file system reaches a hard limit.

Answer: BD