Question: There is a table named Customers with 9 0 rows and a column named Country. Each row has a unique value of Country. What is

There is a table named Customers with 90 rows and a column named Country. Each row has a unique value of Country.
What is the output of the following SQL query?
SELECT COUNT(*) FROM Customers
WHERE Customers.Country <> Customers.Country:
options :
8100
00
C8010
90

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