We typically assume that a process has access to perfect memory. In other words, when a process stores something in memory, that stored value will remain unchanged until the process decides to overwrite it with some other value or the process terminates. Now consider an alternative: the flawed-memory model. In this model, the process has a tendency to forget values over time (especially those values which haven’t been accessed in a while). List the challenges and describe what an OS might do to ensure that processes under the flawed-memory model execute correctly and efficiently.