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What is the correct description of Delta Lake's optimized writes feature?
A
Before a Jobs cluster terminates, OPTIMIZE is executed on all tables modified during the most recent job.
B
An asynchronous job runs after the write completes to detect if files could be further compacted; if yes, an OPTIMIZE job is executed toward a default of 1 GB.
C
A shuffle occurs prior to writing to try to group similar data together resulting in fewer files instead of each executor writing multiple files based on directory partitions.
D
Optimized writes use logical partitions instead of directory partitions; because partition boundaries are only represented in metadata, fewer small files are written.