The following table shows mapping data from three interrupted mating experiments using three differemt if strains and an F strain:

Appearance of genes in $F^{-}$cells

$Hfr1$ Genes $e^{+},f^{+},c^{+},d^{+}$

$b^{+}$

Time $6,24,34,49,54$

Hfr $2$ Genes $b^{+}{d}^{+}{c}^{+}{f}^{+}{g}^{+}$

Time $1,6,21,31,63$

Hfr $3$ Genes $d^{+},c^{+},f^{+},e^{+},g^{+}$

Time $4,19,29,47,61$

$($Time is represented in minutes$)$

The correct combination of answers is

a$.P,R$ and $S$

b$.Q$ and $R$

c$.$ P and Q

d$.Q$ and $S$