Match the species in List I with the oxidation number of the underlined (first-named) element in List II, using the electronegativity order $\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$. List I: (P) Cl in $\mathrm{ClF}{}_3$, (Q) I in $\mathrm{ICl}$, (R) Br in $\mathrm{BrF}{}_5$, (S) I in $\mathrm{IF}{}_7$. List II: (1) $+1$, (2) $+3$, (3) $+5$, (4) $+7$.

1. AP-1, Q-2, R-3, S-4
2. BP-2, Q-1, R-4, S-3
3. CP-2, Q-1, R-3, S-4
4. DP-3, Q-1, R-2, S-4