You issued the following command at the UNIX environment：   % setenv ORA_SDTZ ’OZ_TZ’   What will be the impact of issuing the above command？（）  

A、 The operating system local time zone will be set for a user session using the operating system environment variable.

B、 The database local time zone will be set for a user session using the operating system environment variable.

C、 The operating system local time zone will be set for the database using the operating system environment

D、 The database local time zone will be set for the database using the operating system environment variable.