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(b) One of the techniques for a file system to maintain free-space list in order to track available blocks is through bit map. Assume that there are 4 bits per word and the bit map is as in the figure below. Show how the address of the first free block is calculated. Block o 1 2 3 4 5 6 7 8 9 11 12 13 14 15 No Bit 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 Offset 0 1 2 3 0 1 2. 3 0 2 3 1 2 3 map 1 o = (Number of bits per word * number of O-values words) + offset of first l bit + =