Which MongoDB operation removes all documents that match the specified condition from a collection?a)removeManyb)eraseAllc)removeAlld)deleteMany

The MongoDB operation that removes all documents that match the specified condition from a collection is d) deleteMany.

Here are the steps to use it:

1. Connect to your MongoDB instance.
2. Select the database and the collection you want to work with.
3. Use the deleteMany() method, passing the condition as a parameter. The condition should be a document that specifies the match criteria.

For example, if you have a collection named "students" and you want to remove all documents where the "age" field is less than 20, you would do:

db.students.deleteMany({ age: { $lt: 20 } });

This command will remove all documents from the "students" collection where the "age" is less than 20.