Dataplex is Google Cloud's intelligent data fabric that enables organizations to centrally manage, monitor, and govern data across data lakes, data warehouses, and data marts. It is specifically designed to provide a unified interface for distributed data without moving the data.

Unified Governance: Dataplex allows you to group distributed data (in GCS and BigQuery) into logical Lakes and Zones (e.g., Raw vs. Curated). This structure enables you to apply security policies once at the Lake or Zone level, which then propagates to all underlying assets.

Metadata Discovery: Dataplex automatically scans and registers metadata from your buckets and datasets into the Search/Catalog interface, making it discoverable without manual scripts.

Data Quality & Profiling: Dataplex includes built-in, fully managed features for Data Quality (declarative rules) and Data Profiling to monitor the health of your data directly within the governance framework.

Correcting other options:

A & B: These involve significant manual overhead, custom scripts, and fragmented tools. They do not provide a "unified data governance framework" that scales naturally across both GCS and BigQuery.

C: Dataproc Metastore is primarily for Hive/Spark workloads and doesn't offer the comprehensive security and data quality governance required for a general-purpose federated framework across BigQuery and Cloud Storage.