An Internet$-$based collaborative graphics application includes a shared electronic whiteboard where participants can each annotate and manipulate a high$-$resolution photograph. Two potential architectural solutions have been proposed:

a$.$

Send each user's freehand drawing actions $($individual mouse movements$)$ to a central server.

b$.$

Download an applet, and do drawing actions on a local copy of the whiteboard contents.

Describe advantages and disadvantages of these solutions.