scanimage: unrecognized option

I want to scan a page with *scanimage* and my Brother ADS-1700W scanner. The command I came up with looks like this: scanimage -d "brother5:bus3;dev2" --mode "Black & White" --resolution 300 --AutoDescew=yes --format tiff >out.tiff This yields the following error:

unrecognized option '--AutoDescew'

The AutoDescew-option seems to be supported by my scanner. I checked this by executing scanimage -h which gave me the following output:

Options specific to device `brother5:bus3;dev2':   :

     --mode 24bit Color[Fast]|Black & White|True Gray|Gray[Error Diffusion] [24bit Color[Fast]]
         Select the scan mode
     --resolution 100|150|200|300|400|600|1200dpi 
         Sets the resolution of the scanned image.
     --source Automatic Document Feeder(left aligned)|Automatic Document Feeder(center aligned)|Automatic Document Feeder(left
 aligned,Duplex)|Automatic Document Feeder(center aligned,Duplex)|Card
 Slot|Card Slot(Duplex) [Automatic Document Feeder(left aligned)]
         Selects the scan source (such as a document-feeder).
     --brightness -50..50% (in steps of 1) [inactive]
         Controls the brightness of the acquired image.
     --contrast -50..50% (in steps of 1) [inactive]
         Controls the contrast of the acquired image.
     --MultifeedDetection[=(yes|no)] [inactive]
         
     --AutoDocumentSize[=(yes|no)] [no] [advanced]
         
     --AutoDeskew[=(yes|no)] [no] [advanced]
         
     --SkipBlankPage[=(yes|no)] [inactive]
         
     --SkipBlankPageSensitivity 0..100% (in steps of 1) [inactive]

Why is that option "unrecognized"? Does it have to do with the option being marked as "advanced"? Bonus question: how would I enable the "inactive" options? E.g. SkipBlankPage? I know my scanner supports this, but I have no idea how to enable it...