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Review the following procedure header. Which of the following procedure calls is valid to include in another procedure?

PROCEDURE order_change_sp
(p_prodid IN NUMBER,
p_prodqty IN OUT NUMBER)
IS

a. order_change_sp(100, 362);
b. EXECUTE order_change_sp(100, 362);
c. order_change_sp(100, :g_qty);
d. order_change_sp()

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