$\backslash$table$[[s,120\mathrm{.}00000,0\mathrm{.}00000],[$D$,0\mathrm{.}00000,-24\mathrm{.}00000],[$Constraint$,$Slack$/$Surplus$,$Dual Value$],[1,,,],[\backslash$table$[[1],[2]],0\mathrm{.}00000,31\mathrm{.}00000],[\backslash$table$[[2],[3]],0\mathrm{.}00000,32\mathrm{.}00000],[3,320\mathrm{.}00000,0\mathrm{.}00000],[$Variable$,\backslash$table$[[$Objective$],[$Coefficient$]],\backslash$table$[[$Allowable$],[$Increase$]],\backslash$table$[[$Allowable$],[$Decrease$]]],[--$n$--.-.-.-.,$Coericient,$\backslash$table$[[$Increase$],[-]],\backslash$table$[[$Decrease$]]],[$B$,63\mathrm{.}00000,12\mathrm{.}00000,15\mathrm{.}50000],[$s$,95\mathrm{.}00000,31\mathrm{.}00000,\backslash$table$[[15\mathrm{.}50000],[8\mathrm{.}00000]]],[$D$,135\mathrm{.}00000,24\mathrm{.}00000,\backslash$table$[[8\mathrm{.}00000],[$Infinite$]]],[,$RHS$,$Allowable,Allowable$],[$Constraint$,$Value,Increase,Decrease.$],[1,,,-2.-7],[\backslash$table$[[1],[2]],200\mathrm{.}00000,\backslash$table$[[80\mathrm{.}00000],[80\mathrm{.}00000]],\backslash$table$[[40\mathrm{.}00000],[120\mathrm{.}00000]]],[3,2400\mathrm{.}00000,$Infinite,$320\mathrm{.}00000]]$

Which constraint shows extra capacity? How much?

Labor hours; $320$ hours available.

Labor hours; $2400$ hours available.

Labor hours; $135$ hours available.

Fan motors; $320$ hours available.

None of other choices

Cooling coils; $320$ hours available.