Which of the following is incorrect statement about find and findOne operations in MongoDB?

You perform the following query on the sayings collection, which has the index
{ quote : "text" }:
Assuming the documents below are in the collection, which ones will the following query return? Check all that apply.
db.sayings.find( { $text : { $search : "fact find" } } )

Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?

You perform the following operation in the shell: db.foo.insert( { } ); What gets inserted?

Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?