The HR schema exists in two database

单选题
The HR schema exists in two databases, BOSTON and DENVER, and has the same
Password, HR. You have the CREATE DATABASE LINK and CREATE SESSION privileges
On both the database.
BOSTON is defined as a service name in the tnsnames.ora of both the
Databases. You plan to use the command:
CREATE DATABASE LINK hr_link CONNECT TO hr IDENTIFIED BY hr USING ‘denver’;
What must be done to ensure only the HR user in the BOSTON database can access the HR
Schema in the DENVER database?

A、 Execute this command as HR user in the BOSTON database and SYS user in the DENVER database.

B、 Execute this command as HR user in the DENVER database

C、 Execute this command as HR user in the BOSTON database

D、 Execute this command as SYS user in both the database

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