Identify which of the following are examples of space-multiplexed sharing, and which are time-multiplexed sharing. If there is a sense that it could be either strategy, explain.

a. The land in a residential subdivision

b. A personal computer

e. A whiteboard in a classroom

d. A bench seat on a bus

e. A single-user file in UNIX

f. A printer on a timesharing system

g. The heap in the C/C++ runtime system