Hi Sharon,
Fused is the default when you building a cache at 10.2. Multi-layer caches are no longer supported. See the following link under 'Migrating map and globe caches':
Map and globe caches that you created in ArcGIS Server 10.0 and previous versions can be used in later versions. The only exception is multilayer caches, which are not supported after version 10.0. If you have a multilayer cache, you should rebuild it as a series of separate fused caches