Which of the following statements are generally true? 1. Memory hierarchies take advantage of temporal locality. 2. On a read, the value returned depends on which blocks are in the cache. 3. Most of...

Which of the following statements are generally true?

1. Memory hierarchies take advantage of temporal locality.

2. On a read, the value returned depends on which blocks are in the cache.

3. Most of the cost of the memory hierarchy is at the highest level.

4. Most of the capacity of the memory hierarchy is at the lowest level.