How do caches help improve performance? Why do systems not use more or larger caches if they are so useful? Select one: a. Caches are an 1980's thing and no longer used. b. Caches allow components of differing speeds to communicate more efficiently by storing data from the slower device, temporarily, in a faster device (the cache). Caches are cheap, the cost is the programmers. c. Caches allow components of the same speeds to communicate and slow down the process but hold a great deal of data. Caches are cheap, the cost is the programmers d. Caches allow components of differing speeds to communicate more efficiently by storing data from the slower device, temporarily, in a faster device (the cache). Caches are however expensive the larger they get