Answer: Tables 1 and 4

The default value of spark.sql.autoBroadcastJoinThreshold is 10 MB. Spark will automatically broadcast the smaller table in a join if its size is less than or equal to 10 MB. Tables larger than this threshold will not be automatically broadcasted. In this case: Table 1 (15.2 MB) → larger than 10 MB → not broadcasted Table 2 (2.6 MB) → smaller than 10 MB → broadcasted Table 3 (5.1 MB) → smaller than 10 MB → broadcasted Table 4 (11 MB) → larger than 10 MB → not broadcasted Therefore, the tables that will not be automatically broadcasted are Table 1 and Table 4. Correct Answer: D. More info: [spark.sql.autoBroadcastJoinThreshold](https://spark.apache.org/docs/latest/sql-performance-tuning.html#join-strategy-hints-for-sql-queries).

Author: LeetQuiz Editorial Team