Which statement regarding the ETL (Extract, Transform, Load) process is FALSE?
a. The ETL process is one-directional to avoid duplicate data imported into the data warehouses.
b. The extract process retrieves and import data from disparate databases to create one version of the truth.
c. Data are cleansed, reformatted, denormalized, aggregated during the ETL process based on the DW reporting needs.
d. Transformed data are loaded into the data warehouses periodically to store data snapshots over a period of time.