You need to export the data and for that purpose, you decide to define an external table. Choose the formats from the below-given options that can be used for the external tables in export scenarios? (Choose all that all applicable)

Answer options:

A.CSV
B.XML
C.ORC
D.TSV
E.Delimited
F.JSON
G.Parquet
H.
AVRO

Correct Answers: A, D, F and G 
Utilizing external table in export scenarios is limited only to the four formats: CSV, JSON ,TSV, and Parquet.
Option A is correct. CSV is one of the 4 formats that is valid for the export tables in export scenarios.
Option B is incorrect. XML is not a valid format.
Option C is incorrect. ORC is not a valid format.
Option D is correct. TSV is a valid format for the export tables in export scenarios.
Option E is incorrect. Delimited is not a valid format.
Option F is correct. JSON is a valid format for the export tables in export scenarios.
Option G is correct. Parquet is a valid format for the export tables in export scenarios.
Option H is incorrect. Avro is not a valid format.
Reference: 
To know more about the external tables, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/data-explorer/kusto/management/external-tables-azurestorage-azuredatalake