[tlhIngan Hol] yuQ Suv Duj 'ar or yuQ luSuv Duj 'ar ?

[mayqel qunen'oS]

This must be pretty straightforward, but I'll ask anyway.

Recently, we'd been given the following examples, with regards to how
the construction {noun 'ar}, is to be treated, i.e. singular or
plural.

Duj 'ar DIlegh ?

bIQ 'ar wIlegh ?

So, if the questioned object is countable, then we use a plural prefix.

But does the opposite apply too ?

If we have a questioned subject which is countable, then do we again
use a plural prefix ?

Should one say {yuQ Suv Duj 'ar} or {yuQ luSuv Duj 'ar} ?

I'm pretty sure it must be {yuQ luSuv Duj 'ar}, but I'd like to make certain.

~ mayqel qunen'oS