单选题How should the following UDF be invoked in order to convert US currency values stored in the EXPENSES table into Canadian currency?CREATE FUNCTION getratews11 ( country1 VARCHAR(100), country2 VARCHAR(100) ) RETURNS DOUBLE LANGUAGE SQL CONTAINS SQL EXTERNAL ACTION NOT DETERMINISTIC BEGIN ... END（）ACALL getratews11('USA','CANADA')BCALL expenses.getratews11('USA','CANADA')CSELECT getratews11('USA','CANADA') FROM expensesDSELECT * FROM TABLE(getratews11('USA','CANADA')) AS convert_currency
单选题
How should the following UDF be invoked in order to convert US currency values stored in the EXPENSES table into Canadian currency?CREATE FUNCTION getratews11 ( country1 VARCHAR(100), country2 VARCHAR(100) ) RETURNS DOUBLE LANGUAGE SQL CONTAINS SQL EXTERNAL ACTION NOT DETERMINISTIC BEGIN ... END（）
A
CALL getratews11('USA','CANADA')
B
CALL expenses.getratews11('USA','CANADA')
C
SELECT getratews11('USA','CANADA') FROM expenses
D
SELECT * FROM TABLE(getratews11('USA','CANADA')) AS convert_currency
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