Evaluate these statements: CREATE TABLE purchase_orders
(po_id NUMBER(4),
po_date TIMESTAMP,
supplier_id NUMBER(6),
po_total NUMBER(8,2),
CONSTRAINT order_pk PRIMARY KEY(po_id))
PARTITION BY RANGE(po_date)
(PARTITION Q1 VALUES LESS THAN (TO_DATE('01-apr-2007','dd-mon-yyyy')),
PARTITION Q2 VALUES LESS THAN (TO_DATE('01-jul-2007','dd-mon-yyyy')),
PARTITION Q3 VALUES LESS THAN (TO_DATE('01-oct-2007','dd-mon-yyyy')),
PARTITION Q4 VALUES LESS THAN (TO_DATE('01-jan-2008','dd-mon-yyyy')));
CREATE TABLE purchase_order_items
( po_id NUMBER(4) NOT NULL,
product_id NUMBER(6) NOT NULL,
unit_price NUMBER(8,2),
quantity NUMBER(8),
CONSTRAINT po_items_fk FOREIGN KEY(po_id) REFERENCES purchase_orders(po_id))
PARTITION BY REFERENCE (po_items_fk);
Which two statements are true?