Answer: OAuth, Username and password authentication

The correct answers are A (OAuth) and E (Username and password authentication). According to Snowflake's official documentation on API authentication (referenced in multiple community comments with high upvotes), Snowflake supports both OAuth 2.0 (RFC 6749) and basic authentication using username and password (RFC 7617) for REST API interactions. While key pair authentication (B) is mentioned in some discussions for SQL API specifically, the question asks about primary authentication methods for REST API interactions in general, and the official documentation clearly identifies OAuth and username/password as the supported methods. The community consensus with 73% support for AE, along with references to official documentation, confirms this selection.

Author: LeetQuiz Editorial Team