The sum of the gains of the feedback paths in the above signal flow graph is (a)

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The sum of the gains of the feedback paths in the above signal flow graph is
(a) \(a f+b e+c d+a b e f+b c d e+a b c d e f\)
(b) \(a f+b e+c d+a b e f+b c d e\)
(c) \(a f+b e+c e+a b e f+a b c d e f\)
(d) af + be \(+c d\)

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