There are five students $S_1,S_2,S_3,S_4$and $S_5$in a music class and for them there are five seats $R_1,R_2,R_3,R_4$and $R_5$arranged in a row, where initially the seat $R_i$is allotted to the student $S_i,i=1,2,3,4,5$. But, on the examination day, the five students are randomly allotted five seats.The probability that, on the examination day, the student $S_1$gets the previously allotted seat $R_1$, and NONE of the remaining students gets the seat previously allotted to him/her is$\frac{3}{40}$(b) $\frac{1}{8}$(c) $\frac{7}{40}$(d) $\frac{1}{5}$

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