(a) For each approach to representing files below, show how to calculate the physical address from the logical address using the example logical address for a system with block size 512 by presenting the formula and explaining how to apply its results: (i) contiguous, LA=1028 (ii) linked, LA=2039 (iii) indexed, LA=5066 (iv) file allocation table, LA=8049 (v) double indirect, LA=236468 (b) For each method in (a) above give one positive and one negative characteristic. (2 pts each)