Answer "B" is correct.
External tables are read-only. You cannot perform data manipulation language
(DML) operations on them. However, you can use external tables for query and join operations. You can also create views against external tables.
B
External tables are read only.
https://docs.snowflake.com/en/user-guide/tables-external-intro#:~:text=External%20tables%20are%20read%2Donly,create%20views%20against%20external%20tables.
Correct, so DML operations cannot be performed (INSERT, UPDATE, DELETE).
ALTER is DDL.
If you read the link you pasted carefully, you will find ALTER EXTERNAL TABLE statement.
Answer is D
D
https://docs.snowflake.com/en/sql-reference/sql/alter-external-table
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