Multiple Modifiers when querying MongoDB with C# 2.0.1 driver -

i'm working mongodb in visual studio, using c# 2.0.0 driver. (i new mongodb 3.* , new visual studio / c#, experienced in python, java, , mongodb 2.6)

i'm working on research related topic, , therefore need able specify index operation should use , explained result. (i want explain bsondocument, not matching docs.)

i know how either 1 of them, ex explain: (here projecting bsondocument since collection isn't of type bsondocument)

var options = new findoptions         {             modifiers = new bsondocument("$explain", true)                         };  bsondocument explain = await coll.find(filter, options).project(new bsondocument()).firstordefaultasync(); 

or use specified index:

var options = new findoptions         {             modifiers = new bsondocument("$hint", "indexname")                          };  var cursor = await coll.find(filter, options).tolistasync(); 

but don't understand how add index hint modifier parameter well?

is possible both?