In your Supportcenter.cn production database，you find that the database users are able to create and read files with unstructured data，available in any location on the host machine from an application. You want to restrict the database users to access files in a specific location on the host machine. What could do to achieve this？（）

A. Modify the value for the UTL_FILE_DIR parameter in the parameter file
B. Grant read and write privilege on the operating system path to the database users
C. Modify the value for the LDAP_DIRECTORY_ACCESS parameter in the parameter file
D. Modify the value for the PLSQL_NATIVE_LIBRARY_DIR parameter in the parameter file
E. Create a directory object referring to the operating system path， and grant read and write privilege on the directory object to the database user