When a DBaaS database instance is created, network access to the instance is limited to Secure Shell (SSH) connections on port 22. This access restriction ensures that the instance is secure by default. You can either ask your cloud service administrator to open ports or, as you will learn in this tutorial, you can use SSH client software to create an SSH tunnel to connect securely to the database and its tools. Several SSH clients are freely available, including the SSH utility on Linux platforms and the PuTTY utility on Windows platforms.
I agree D : https://www.oracle.com/webfolder/technetwork/tutorials/obe/cloud/dbaas/obe_dbaas_connecting_to_an_instance/obe_dbaas_connecting_to_an_instance.html
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