physical memory consists of 4 page frames, initially all empty. the following reference string is processed: 0 1 4 0 2 3 0 1 0 2 3 4 2 3 (a) show which pages are resident under the second chance page replacement algorithm. indicate when page faults occur. (b) assume that references to page 1 are write references (modifying page 1) and all others are read references. show which pages are resident under the third chance page replacement algorithm. indicate when page faults occur.