【单选题】
A SELECT prod id,
AVG(MAX (cost)) FROM products GROUP BY prod.
B <{p}>SELECT prod id, MAX
(AVG (cost)) FROM products GROUP BY prod id:<{br/}><{/p}>
C <{p}>Select prod id,
release date, SUM(cost) FROM products GROUP BY prod id<{br/}><{/p}>
D <{p}>SELECT prod id,
release date, SUM(cost) FROM products GROUP BY prod id, release date<{br/}><{/p}>
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