[单选题]In your Certkiller .com production database， you f

AModify the value for the UTL_FILE_DIR parameter in the parameter file

BGrant read and write privilege on the operating system path to the database users

CModify the value for the LDAP_DIRECTORY_ACCESS parameter in the parameter file

DModify the value for the PLSQL_NATIVE_LIBRARY_DIR parameter in the parameter file

ECreate a directory object referring to the operating system path， and grant read and write privilege on the directory object to the database users