To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) AFTER statement trigger - This option is correct. AFTER statement triggers are valid trigger types in database systems. They are executed after a SQL statement is executed.
Option B) INSERT row trigger - This option is incorrect. INSERT row triggers are not valid trigger types. Instead, you can use an AFTER INSERT trigger or a BEFORE INSERT trigger.
Option C) DELETE row trigger - This option is incorrect. DELETE row triggers are not valid trigger types. Instead, you can use an AFTER DELETE trigger or a BEFORE DELETE trigger.
Option D) UPDATE row trigger - This option is incorrect. UPDATE row triggers are not valid trigger types. Instead, you can use an AFTER UPDATE trigger or a BEFORE UPDATE trigger.
The correct answer is A) AFTER statement trigger. This option is correct because AFTER statement triggers are valid trigger types in database systems. They are executed after a SQL statement is executed.