To answer this question, let's analyze the given SQL query:

SELECT address1||','||address2||','||address2 "Adress" FROM employee;

This query is selecting the concatenation of the address1, address2, and address2 columns from the employee table, separated by commas. The result is being aliased as "Address".

Now let's go through each option to determine the correct answer:

Option A) 1 - This option is incorrect because the query does not output the value 1.

Option B) 2 - This option is incorrect because the query does not output the value 2.

Option C) 3 - This option is correct. The query concatenates the values of address1, address2, and address2 columns with commas in between, and aliases it as "Address".

Option D) 0 - This option is incorrect because the query does not output the value 0.

Therefore, the correct answer is C) 3.

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