A two level page table solves the problem of ______. 1. Not enough memory 2. Contiguous storage of very large page 3. Contiguous storage of very small page Tables 4. A very small physical address space tables One, single page table used to manage all of physical memory is a/an ______. 1. Multi-level page table 2. Inverted page table 3. Converted page table 4. Single process page table The Page Table Base Register (PTBR) is loaded with the address of a page table at ______. 1. Context switch of a process 2. Mapping time 3. Boot time 4. Address translation time Segmentation of memory and programs is similar to paging except ____. 1. Partitions are fixed size 2. Partitions are variable size 3. Currently used more than paging 4. Is simple to implement