What file must be downloaded to connect to an Oracle Autonomous Data Warehouse Cloud Service Instance?

To connect to an Oracle Autonomous Data Warehouse Cloud Service Instance, the credential zip file is essential. This file contains the necessary credentials and configuration details required to authenticate and establish a secure connection between the user's local environment and the cloud service. The credentials typically include information such as wallet files, which facilitate secure connections using SSL/TLS, and may also contain additional user-specific settings.

Downloading the credential zip file is a critical step because it encapsulates everything needed for a secure and effective connection. Without it, you would not be able to properly authenticate or interact with your data warehouse, making it a fundamental component of the connectivity process.

While there are other files related to configurations or installations, they do not serve the same purpose in facilitating a secure and authenticated connection to the cloud service. Thus, the credential zip file stands out as the correct answer, as it provides the necessary tools for access and ensures that the connection remains secure.