Which setting is NOT allowed?

Note the following parameter settings:

SQL> show parameter DB

NAME              TYPE        VALUE
—————– ———– ——-
db_16k_cache_size big integer 0
db_2k_cache_size  big integer 0
db_32k_cache_size big integer 0
db_4k_cache_size  big integer 0
db_8k_cache_size  big integer 0
db_block_buffers  integer     0
db_block_checking string      FALSE
db_block_checksum string      TYPICAL
db_block_size     integer     8192
db_cache_advice   string      ON
db_cache_size     big integer 0

Which setting is NOT allowed?

A.
ALTER SYSTEM SET DB_CACHE_SIZE=50M;

B.
ALTER SYSTEM SET DB_8K_CACHE_SIZE=10M;

C.
ALTER SYSTEM SET DB_4K_CACHE_SIZE=10M;

D.
ALTER SYSTEM SET DB_16K_CACHE_SIZE=10M;

Explanation:
http://www.akadia.com/services/ora_asm_multiple_block_sizes.html

db_block_size integer 8192 – is the db default so you can’t have 8K subcache