An online tablespace, TEST_TBS, is full and you realize that no server-managed tablespace threshold alerts were generated for the TEST_TBS tablespace. What could be the reason, if the TEST_TBS tablespace does not include autoextensible data files?（）

A. TEST_TBS is a small file tablespace.

B. TEST_TBS is a bigfile tablespace (BFT).

C. TEST_TBS is the default temporary tablespace.

D. TEST_TBS is a dictionary-managed tablespace.