The series combination of the last elements after replacing 1/s and 1

1.	The series combination of the last elements after replacing 1/s and 1/4Ω with 1/(S+4) is?
A.	(3s+4)/2s(s-4)
B.	(3s-4)/2s(s-4)
C.	(3s+4)/2s(s+4)
D.	(3s-4)/2s(s+4)
Answer» D. (3s-4)/2s(s+4)

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