Which of the following are not true about N-Tier Systems?

1. N-Tier systems are distributed over many systems and hence always present a maintenance problem.
2. N-Tier systems are generally component based and are therefore quite easy to maintain.
3. Since N-Tier systems do not use database stored procedures or triggers for business logic processing, they are generally very slow.
4. Since N-Tier systems are container based, many N-Tier systems can be easily scaled (both vertically and horizontally).
5. N-Tier systems suffer only from one drawback over client/server systems - N-Tier systems do not take advantage of resource sharing techniques like connection pooling.
6. N-Tier systems can use various techniques for Identification, Authentication and Authorization and are therefore considered quite secure.