What mechanism does Presto use in watsonx.data to query different data sources like Db2; PostgreSQL; and object storage?

Presto's pluggable connector architecture allows it to query diverse sources through source-specific connectors (Hive; Iceberg; JDBC; Kafka; etc.) each handling the translation between Presto's query model and the source system. The incorrect options ("A proprietary IBM data adapter that converts all sources to a single format", "Direct JDBC calls without any abstraction layer", "A single universal driver that handles all source types identically") are distractors that don't fully capture the concept described.