Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE and QUANTITY, of data type NUMBER. Examine these

Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE and QUANTITY, of data type NUMBER.
Examine these SQL statements:
Statement 1:
SELECT MAX(unit_price * quantity) “Maximum Order”
FROM order_items;
Statement 2:
SELECT MAX(unit_price * quantity) “Maximum Order”
FROM order_items
GROUP BY order_id;
Which two statements are true?

A. Statement 1 returns only one row of output.

B. Statement 2 returns only one row of output.

C. Both statements will return NULL if either UNIT_PRICE or QUANTITY contains NULL.

D. Both the statements give the same output.

E. Statement 2 may return multiple rows of output.

Correct Answer: A,E

https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj27781.html
The Expression can contain multiple column references or expressions, but it cannot contain another aggregate or subquery. It must evaluate to a built-in data type. You can therefore call methods that evaluate to built-in data types. (For example, a method that returns a java.lang.Integer or int evaluates to an INTEGER.) If an expression evaluates to NULL, the aggregate skips that value.