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Given the following index creation and query: db.users.createIndex({gender: 1, user_name: 1}) db.users.find({gender: “M”}, {user_name: 1, _id: 0}) What is the most important reason this query is considered a covered query?

Which of the following commands will limit the number of documents displayed to 2?

Which of the following options best describes how MongoDB ensures data consistency across a sharded cluster?

Consider the following query: db.books.find({$nor: [{“publication year” : “2016”}, {“title” : “MongoDB”}]}).pretty() What does this query return?

When using the $group stage in MongoDB’s aggregation framework, which of the following fields is mandatory?

Consider the following query using $hint: db.users.find({gender: “M”, name: “Tom Benzamin”}).hint({gender: 1, name: 1})’ Why would you use the $hint method in this case?

What is another term for a poison?

The type of immunity that offspring receive from their mother is:

What is the term for the accumulation of fluid in tissue?

What is another term for WBCs?