Final answer:
Newer Palm OS devices transitioned to using ARM architecture-based StrongARM and XScale microprocessors, moving away from the Motorola DragonBall MC68328 family.
Step-by-step explanation:
The Palm OS is an embedded operating system that was initially designed to run on the Motorola DragonBall MC68328 family of microprocessors. When newer devices were developed, the Palm OS transitioned to using ARM architecture-based microprocessors. Specifically, the newer devices use b) ARM architecture-based StrongARM and XScale microprocessors.