What describes the operation of the write-through cache in a block-based storage system?

A.
Data is placed in the cache. Data is written to the disk. An acknowledgement for the write
is sent.

B.
Data is placed in the cache. An acknowledgement for the write is sent immediately. Data
is later written to the disk.

C.
Data is written directly to the disk without being placed in the cache. An
acknowledgement for the write is sent.

D.
Data is written directly to the disk. An acknowledgement for the write is sent immediately.
Data is later placed in the cache.