C. Adding A and B is helpful too though sometimes that info is assembled into a maintenance manual.
Since we're just talking lens and not screen size, projector brightness, resolution etc., I'd request A. to find a clear spot for the projector in the ceiling and to estimate the throw distance to the screen surface and I'd also check the elevation for vertical offset to ensure the lens selected can operate within the vertical lens shift range stated by the manufacturer.
D. and hopefully everyone is updating firmware before commissioning too
A. and if the service is worthwhile, useful but limited remote servicing features like AC power/PoE reboot, firmware updates, and device control.
Sad that our industry gives away detailed budgets (I hope not itemized!!) during the design phase. A budgetary estimate is appropriate for the design phase but a detailed budget is a bid.
Darn I thought it was white level and contrast adjusted black level. Getting old.