What are the primary advantages a three-tier system has over a two-tier system?
A three-tier system has thin clients whereas a two-tier system will always have fat clients.
A three-tier system will out perform a two-tier system.
A three-tier system is easier to manage than a two-tier system.
A three-tier system is easier to secure.
A three-tier system can be both vertically and horizontally scaled whereas a two-tier system can only be horizontally scaled.
A three-tier system is more extensible than a two-tier system.