Which three possible values can be set for the TIME_ZONE session parameter by using the ALTER SESSION command?

Australia is the whole continent. There are different time zones. D is wrong.

hello, are these question still valid?

questions are still valid.About 75% of questions will be in the real exam.
Example o an addiional questions:
How to find difference in time between the ‘AMERICA/NEW_YORK’ TZ and UTC.
A. SELECT TO_TIMESTAMP_TZ(‘AMERICA/NEW_YORK’) FROM dual;
B. SELECT TO_YMINTERVAL(‘AMERICA/NEW_YORK’) FROM dual;
C. SELECT FROM_TZ(‘AMERICA/NEW_YORK’) FROM dual;
D. SELECT TZ_OFFSET(‘AMERICA/NEW_YORK’) FROM dual;

SELECT hire_date, last_name, salary, LAG(salary, 1, 0) OVER (ORDER BY hire_date) AS prev_sal from employees
WHERE job_id = ‘SA_MAN’ ORDER BY hire_date;
A. It displays salesman who were hired in the current month and have not drawn any salary.
B. It fails because of the GROUP BY clause is not used.
C. It fails because the ORDER BY clause at the end should not be used with the LAG … OVER function.
D. It displays the hire_date, last_name and salary values of each salesman along with the SALARY value of each salesman hired before them.
E. It displays each salesman and the SALARY values of each salesman and SALARY value of the employee hired just after each salesman.