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Answer: Option C) $S+R’Q$

The SR flipflop behaves as :- 

$(0,0) → Q_n (Hold)$

$(0,1) → Reset$

$(1,0) → Set$

$(1,1) → Invalid$

Hence in K-Map:-

byjusexamprep

So characteristic equation becomes:-

$Q_{n+1} = S+R’Q_n$