If the incident matrix of a graph is given below. The corresponding graph is?

[answerhappygod]

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a b c d e f
1 +1 0 +1 0 0 +1
2 -1 -1 0 +1 0 0
3 0 +1 0 0 +1 -1
4 0 0 -1 -1 -1 0
a)

b)

c)

d)