A user wants to determine how many documents they own. Which query will do this?

A.
select count(*) from dm_document where owner_name = user

B.
select sum(*) from dm_document where owner_name = user

C.
select sum(r_link_cnt) from dm_document where owner_name = user

D.
select number_of(object_name) from dm_document where owner_name = user

Explanation: