Consider four figures A, B, C and D that are defined in the co-ordinate plane. Each figure represents the graph of a certain function, as defined below: A: | x | - | y | = a B: | x | + | y | = a C: | x | = c D: | y | = d 1)If a = 2 and c = 5, find the area of the region enclosed by A and C.2)If the area enclosed by A and D is 0, which of the following is a possible value of (a, d)?

1) 18, (-2,1)
2) 9, (2,1)
3) 4.5 ,(2,3)
4) 0 ,(-2,1)