Which two CREATE INDEX statements are valid?

View the Exhibit and examine the structure of ORD and ORD_ITEMS tables.
In the ORD table, the PRIMARY KEY is ORD_NO and in the ORD_ITEMS tables the
composite PRIMARY KEY is (ORD_NO, ITEM_NO).
Which two CREATE INDEX statements are valid? (Choose two.)

A.
CREATE INDEX ord_idx
ON ord(ord_no);

B.
CREATE INDEX ord_idx
ON ord_items(ord_no);

C.
CREATE INDEX ord_idx
ON ord_items(item_no);

D.
CREATE INDEX ord_idx
ON ord,ord_items(ord_no, ord_date,qty);