(单选题)20: Given the code:
EXEC SQL WITH most_cities AS
(
SELECT b.id, b.name, a.cities
FROM country a, staff b
WHERE a.person = b.id AND
cities > :threshold
)
SELECT id, name, cities FROM most_cities
INTO :id, :name, :cities
WHERE cities IN (SELECT MAX(cities) FROM most_cities)
Which of the following can reference MOST_CITIES?
A: The current statement
B: Statements from any application
C: All statements within this application
D: All statements within the current unit of work
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